Add ifdefs for QCOM-specific features

Change-Id: I6e140e0dab9f2ce929c356f9c486309bb7e23099

Conflicts:
	core/jni/android_hardware_Camera.cpp
	core/jni/android_media_AudioFormat.h
	core/jni/android_media_AudioTrack.cpp
	core/jni/android_view_Surface.cpp