Initial callisto defconfig & build fixes

* Initial cyanogenmod_callisto_defconfig
* Adjust board-msm7x27.c to support ta8566 driver correctly
* Don't override CROSS_COMPILE or ARCH in Makefile
* Fix driver section mismatches in vibrator and lcdc drivers

Change-Id: I44b8e8c2283452b3385f83af1423e79d65bebd9a