Fix audio_policy.conf

* AUDIO_DEVICE_OUT_FM is not enabled for endeavoru and also the Tegra blobs
  think the value is 0x10000 whereas in CM it is 0x80000.
* AUDIO_DEVICE_IN_BACK_MIC is not attached by default when the Tegra audio
  policy is used although the HTC audio_policy.conf says otherwise. This
  fixes audio recording in the camera.

Above information can be obtained by comparing the output of
'dumpsys media.audio_policy' when using the Tegra audio policy (patches
required) and the default one.

Change-Id: I664dab6179fbf072fd5943849c29ccbe5aafa40b