build: Inline kernel building as a buildtime task

Kernel image integration is now done in the build system. The
"one true way" of doing this is to download the kernel source
into kernel/TARGET_BOOTLOADER_NAME (by usage of the cm.dependencies
mechanism or otherwise), and defining the TARGET_KERNEL_CONFIG
variable in the device's BoardConfig makefile

If the kernel's location doesn't match the automagic location
(multi-device kernel source, for instance), TARGET_KERNEL_SOURCE
can be used to specify a kernel path (i.e.,
"TARGET_KERNEL_SOURCE := kernel/shared-whatever")

If the device requires out-of-kernel-tree modules to be built,
the TARGET_KERNEL_MODULES variable can be used, pointing to a
_make target_ that will build and install such modules. Definition
of such a target is the device author's responsibility, the only
restriction is that it is a normal makefile recipe (example
below)

Optionally (or as an alternative), a prebuilt binary can also be
defined at BoardConfig, by usage of the TARGET_PREBUILT_KERNEL
variable. This binary will be used if the kernel source is absent
(or undefined).

A minimal BoardConfig.mk should look something like this:

TARGET_KERNEL_CONFIG := cyanogenmod_<device>_defconfig
TARGET_PREBUILT_KERNEL := device/<vendor>/<device>/kernel

To include, for example, the TI WLAN modules, this can be used:

-----------------------------
TIWLAN_MODULES:
       make -C hardware/ti/wlan/wl1283/platforms/os/linux/ KERNEL_DIR=$(KERNEL_OUT) ARCH="arm" CROSS_COMPILE="arm-eabi-" TNETW=1273 RANDOM_MAC=n REPORT_LOG=n
       mv hardware/ti/wlan/wl1283/platforms/os/linux/tiwlan_drv.ko $(KERNEL_MODULES_OUT)
       make -C hardware/ti/wlan/wl1283_softAP/platforms/os/linux/ KERNEL_DIR=$(KERNEL_OUT) ARCH="arm" CROSS_COMPILE="arm-eabi-" TNETW=1273 REPORT_LOG=n
       mv hardware/ti/wlan/wl1283_softAP/platforms/os/linux/tiap_drv.ko $(KERNEL_MODULES_OUT)

TARGET_KERNEL_MODULES := TIWLAN_MODULES
---------------------------

Change-Id: I8634fa4c788a42dc6f62e62ca170825b66db126a
build: Fix kernel module building on Darwin/OSX

Darwin/OSX build host does not have module-init-tools which is
required to generated modules.dep file. Switch to modules.order
file marker which is always generated instead.

Change-Id: I20c0fccd905fa668202c3e7284a8778db3728a65
kernel: Change path to kernel/<vendor>/<device>

Derive the kernel path from the device's own path (just replace "device"
with "kernel")

Change-Id: Idd44a0489e1ce280adf5ec4d9cfe2385c75dd115
kernel: Improve support for non-arm architectures

Remove hardwired references to the ARM arch and toolchains, and replace
them with the respective android build variables

Change-Id: Iae3eb548ca1d58ac808b5fa430d415283a809106
kernel: Fix ARM building

The default android ARM compiler, arm-androideabi-, does NOT work
for the Linux kernel. Special-case the ARM architecture to target
the ARM_EABI_TOOLCHAIN path directly

Change-Id: Ib672c99f114cb89d5fda3343d4dc68810d042d35
kernel: allow TARGET_KERNEL_MODULES to overwrite kernel modules

This is necessary to use compat-wireless since it needs to build a newer
version of cfg80211 (and sometimes mac80211) than the kernel sources version.
There are probably other instances of this type of need.

Change-Id: Ib5bf818286bc20987d8b9f9480a43f3e7690e239
kernel.mk: make use of ccache when requested

Change-Id: I9b6e28711bd5f590a76ac2b62a50b1d2de014e3e
kernel: Fix ccache inclusion logic

Builds were broken when CCACHE was missing from the environment
Change-Id: Ie8d6048f4600f1dc9c298593a50e37af04b96438
build: show accurate information on inline kernel warnings/errors

Having the variables on AndroidBoard as suggested causes errors
with mm/mmm, whereas having them on BoardConfig doesn't. Adjust
the warnings to reflect this.

Change-Id: I554c1f1073df678d36521f73bc236a1f4b02212e
kernel.mk: Also search PRODUCT_COPY_FILES for the kernel copy, as that is how AOSP does it now.

Change-Id: Id2d1cf079694d1996d4a85d8435c2e4562e5d444
kernel.mk: fix compiled kernel copy

Change-Id: Ifb2a3d4968e56eed236eaa2db9258cd0b8865fda
kernel.mk: workaround to fix kernel builds on darwin until the prebuilts/gcc is checked in by upstream.

Change-Id: I6321fb7f6814b207c821d974766d945351b3f546
kernel: allow to specify a custom toolchain for kernel build

TARGET_KERNEL_CUSTOM_TOOLCHAIN := arm-eabi-4.4.3

Also removed workaround for darwin (I6321fb7f6814b207c821d974766d945351b3f546)
since the binaries got merged

Change-Id: I12f3587ce7c85ee6d3741f0619a376b13a936a90
kernel.mk: Fix darwin regression caused by 732db8b1.

Change-Id: I1d9c2e231eca695ff6292ce5e163580cfd3fbb86
build: fix ccache usage when building kernels

Change-Id: Id4edd4d85d9ba3ef42575f5fdebf22ed14957a99
kernel.mk: set KERNEL_OUT properly

It was hardcoded to $(ANDROID_BUILD_TOP)/$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
which wouldn't exist if OUT_DIR_COMMON_BASE was set to use another dir
(e.g. ramdisk)

Fix it so that it now points to $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
if OUT_DIR is not out

Change-Id: I1bf767d86548e41270d9cbb8f0c00512708501c5
build: kernel: remove hard coded darwin toolchain.

* Use latest kernel toolchain from $(ARM_EABI_TOOLCHAIN) variable.

Change-Id: I3b43408937dd5f193fcba19c034f868272de8963
build: Add support for extra kernel build variables

Summary:
 * This allows specifying a variant defconfig, and an selinux defconfig
   which are simply configuration fragments.

Test Plan: Instamerge

Differential Revision: http://review.codefirex.com/D149