Update Build Script II

Change-Id: I5b86217996f4cdbce354cdd1557236dcbef2002b
Enable appended devtree on the G2
Add the defconfig options, and fix the makefile to include all the
files (and use the right config options, s/ARCH/MACH/).

Won't do anything unless the build process requests zImage-dtb

Change-Id: I28cf4a9025885393a0d6138c476df797190e51ac
prepare config

Change-Id: Iaa25ea11cb5c90074dd106a50a133977c5b0f057