rename "QC_AV_ENHANCEMENTS" flag to "AV_ENHANCEMENTS" as per this commit:

https://github.com/CyanogenMod/android_frameworks_av/commit/0e1608f270a37db756258dd9d9234d6da54bd297

Change-Id: I79af51bc67c69442fd1623e7981581ec87230085
Add new flags for all the legacy EGL stuff in frameworks/native

Change-Id: Ia96557d534e6ccaf888e59a4fee96cbfd44c972a
Merge remote-tracking branch 'hydra/cm-11.0' into cm-11.0