dts: Added support for multiple dtbs in u-boot

dtbs are made as .o
a table specifying their machid and address is added
the dtbs and header are added to u-boot image in a seperate section
dtb will be chosen based on machid detected from SMEM

Change-Id: I50ac5b56da3a431c1a75cb9fc113fafaedbc09b8
Signed-off-by: Manoharan Vijaya Raghavan <mraghava@codeaurora.org>
8 files changed