build: Relax Cortex CFLAGS

 * Always set march=armv7-a
 * Use mtune instead of mcpu. Bad code is generated on A15 otherwise.

Change-Id: Idf8ced8eb0e9d3d4676ca8ec69bf56aed5533bf4
Cleanup build for android 4.2.2 using some cm stuff too

included should be the stuff for fmradio support.

Signed-off-by: travp624 <travp624@gmail.com>
Merge remote-tracking branch 'upstream/jb-4.2' into jb-4.2