serrano: FM: Added support for audio routing from speaker to BT headset

Change-Id: I241a74c603098236bd7e16b269732ada48cecf7f
serrano: Add group permission for msm_rotator

 * This will add the msm_rotator device to graphics group,
   to have full access of msm_rotator device functionality.

Change-Id: Ia7e07d1f29546818feb655a9d9c6f12e8b0a2c6d