display: added OVERRIDE_RS_DRIVER flag

Change-Id: I7888e4a5a9b4dce661adcac891ec22929ab4df62
audio: change a2dp sampling rate to 48000 to match bluedroid

Change-Id: Ia9d71ca0f3cd57ac0fe4f70c014d2d34e9a9b4df
Merge branch 'android-5.0' of https://github.com/omnirom/android_device_oppo_msm8974-common into HEAD