samsung_qcom-common: Remove feature overlays for now

Change-Id: Ib9083c20e113220f5b46894b0cedfd2348bd6b53
Add apq8084 to build barrier

Change-Id: Ic7b0ea7ae77c08f075c0af464ef37cbf26d03ccf
Remove redundant CFLAGS

* This is set in qcom_target.mk

Change-Id: Iadb614ff1f95684efbbfa8a752486a459bba28e1