P51XX: add "AUDIO_DEVICE_OUT_EARPIECE" to audio_policy.conf

Change-Id: Ia9a30986ee78679ef0adeee077258dd9cfc3f47b
(cherry picked from commit 02287c0a680dfb2ef68128a6f8be8ade015089bd)
P51XX: dock audio: follow your little brother

Match P31XX changes.

Change-Id: Ibac84ff0c2193a35f041fe40ec050a95733d970d
Merge "P51XX: add "AUDIO_DEVICE_OUT_EARPIECE" to audio_policy.conf" into cm-10.2