QCV: add new property and sepolicy to detect fwk

The current solution of runtime dection of pure AOSP
based on "ro.build.id" will hit issue at OEM side as
they will modify it. we define new public readable
property ro.vendor.qti.va_aosp.support to solve it.

Change-Id: Id614eae63a5792193ff4c7462428484a0452ad17
CRs-Fixed: 2379644