Move audio_firmware_file and /data/misc/audio entry to core sepolicy.

Needed after external/sepolicy 8bebb1c5dd10f704d0f5c90b9c51ed7f3e91eb06
(Change-Id: Id36203f5bb66b5200efc1205630b5b260ef97496)

Change-Id: I479b63346fb0e714f51f7dd1f4f42eacf7044418
Signed-off-by: Chirayu Desai <cdesai@cyanogenmod.org>