ARM: convert build of appended dtb zImage to list of dtbs

Allow CONFIG_BUILD_ARM_APPENDED_DTB_IMAGE_NAMES to specify
a space separated list of dtbs to append to the zImage,
and name the resulting file zImage-dtb

Change-Id: I36d9108a2349bdbb373e95076dcb1417d8c7dce6
Signed-off-by: Colin Cross <ccross@android.com>

Conflicts:
	arch/arm/Kconfig
	arch/arm/Makefile
Signed-off-by: Patrick Tjin <pattjin@google.com>
Fix python for arch linux that uses python3 default
zee: Add CC_OPTIMIZE_FOR_PERF and ""_FOR_SPEED and more opts

Originally for the d2

Change-Id: I2af7808c70df7ab297b94be99b5be241f2375aca
Signed-off-by: bmc08gt <bmc08gt.teamb00sted@gmail.com>
Signed-off-by: Hieu Phan <aznrice2k4@gmail.com>