build: Clean up QCOM flag definitions

Change-Id: I66bca2db83260ccd65b82e540ee9f7961f00b030
(cherry picked from commit 269ab1996650be405d1d037da6d8f8d8110850fb)

Conflicts:
	core/qcom_target.mk
build: Add QCOM flags to Clang CFLAGS

Change-Id: I56f0d4106f5d3d27c1ace744d30c1c81f0052bbd
(cherry picked from commit 7ff848a2c0be11552d71902f414989ecfdd58c61)