Clean up and reorganize all the build optimizations (Squashed)

1)Remove all redundant flags
2)Move all device optimizations to the build repo
3)Clean up all unneeded code

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

PS1:Global -0fast

Conflicts:
	core/combo/TARGET_linux-arm.mk

PS2:Bring back Krait optimizations and more cflag tweaks