build: move bionic optimizations to NEON makefile

Change-Id: Idd495ddbb49f67fef5496456803263f8a23643c5
build: Relax Cortex CFLAGS

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

Change-Id: Idf8ced8eb0e9d3d4676ca8ec69bf56aed5533bf4
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_build into jb-mv

Conflicts:
	core/combo/arch/arm/armv7-a-neon.mk

Change-Id: I8c4c9f5ee048dc65fc83a48a8df3ff6e45b1e0e5