defconfig: disable powersave and userspace cpu governors

Change-Id: I961bc0f4025b6cc4dddf7a28eec75732482730bd
ignore warnings to build using gcc 4.6

Change-Id: I7d00e90ca1ca1fc325f527f29b876098b999ff68
makefile optimizations

Change-Id: I3a22bdb7f29460c460a9b30539d25e839fc325c0