Revert "really use linaro toolchain for building the rom"

This reverts commit d83c525bcd4a4606f2f779bdf81759db89414f56.
add config option: FULL_LINARO
with this option set to true in device tree, every part of the rom is built by using linaro toolchain

Change-Id: Ib7822952ffbbc5e8689f8f26fa07f096ea6dfb03
use google arm-linux-androideabi-4.8, if not using linaro toolchain + cflags

Change-Id: Iebd0fd12e3fa885f7d2aecd6141e810c276ae79b