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

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

Conflicts:
	arch/arm/Kconfig
	arch/arm/Makefile
Signed-off-by: Patrick Tjin <pattjin@google.com>

Change-Id: Id812b45d449d8a3f391717a8cbe21feef211d2c7
Merge "ARM: convert build of appended dtb zImage to list of dtbs" into cm-11.0