u-boot-lsi: Add do_get_tag() compiling task

- To get the source tag, add new python function do_get_tag() as
compiling step after do_patch, before do_build.
- Update SRCREV to tag 5.8.1.43 for lsi-v2013.01.01 branch
- Update SRCREV to tag 4.8.1.90 for lsi-v2010.03 branch

Signed-off-by: Paul Butler <paul.butler@windriver.com>
u-boot-lsi: Add pkg to IMAGE_INSTALL from layer.conf

In order to have u-boot-lsi package in all the image types,
added it to IMAGE_INSTALL from conf/layer.conf

Signed-off-by: Paul Butler <paul.butler@windriver.com>
conf/machine: Add new mahcines: acp and axm

- Add new machine configuration for the LSI ACP family (powerpc):
acp.conf and for LSI AXM5500 systems: axm
- Set KARCH variable for axm5500 and elpaso machine conf

Signed-off-by: Paul Butler <paul.butler@windriver.com>
linux-yocto: Add support for DTB and FIT images

LSI Axxia boards are able to boot from FIT images.
Add support to build the dtb and fit images including the
dtb, linux image and both: multi.fit images.

Signed-off-by: Paul Butler <paul.butler@windriver.com>
linux-yocto: Reorganize recipes-kernel/linux files

- Delete defconfig for axm5500 simulator
- Organize axm5500 and elpaso defconfig by architecture
- In kernel recipes specify SRCREV_machine and SRCREV_meta tags for
building kernel instead of ${AUTOREV} which built from tip of the repo.
LSI_KERNEL_TAG will be manually seted depending on the value of SRCREV.
- Add FIT support files to SRC_URI only for standard kernels.
- Use a single linux-yocto.inc file containing additional building infos
for all kernel receipes instead separated ones for 3.4 and 3.10.

Signed-off-by: Paul Butler <paul.butler@windriver.com>
linux-yocto: Add functions for building DTB and FIT images

Create additional functions to append do_compile and do_deploy tasks
for kernel, function that will build the dtb, create fit images and
install them for multiple targets:
- acp25xx
- acp342x
- acp344x
- ACP344xV2
- acp35xx

Signed-off-by: Paul Butler <paul.butler@windriver.com>