libstagefright: Add Utilities for QC Enhancements
Introduce a QCUtils file containing utility methods
for QC enhancements. Enable these features only if
TARGET_ENABLE_QC_AV_ENHANCEMENTS is true.
Add following enhancements:
- High Frame Rate (HFR) recording
- Shell property to disable audio
- Shell property to override encoding profiles
- Support for B frame encoding