msm8974-common: use qcom bionic optimization

Change-Id: Iac9174a2ac0d41319ca0c2e66f6ae7c94bc7b3f2
msm8974-common: remove depreciated QCOM variant flags

Change-Id: I82502f28ed74d4a3582b4fe805464f9f66025ccc

Conflicts:
	BoardConfigCommon.mk
WIP fix video recording

Change-Id: Ifc26e9f48b639aa30d658c686dda654a2ee72b8b