m8: enable qcom bionic optimization, remove deprecated krait

Change-Id: I2cd81f7ce427c6e69653d4f62773c41d0c85b615
Merge remote-tracking branch 'cm/cm-12.0' into cm-12.0

Conflicts:
	BoardConfig.mk

Change-Id: I64f526e76e2187d78048f01cf198868341c7d37c