audio: Add 13ch audio support for 360 Reality Audio

 - Add definitions for the front bottom channels.
 - Add definition for 13ch mask which uses surround 5 channels,
   top 5 channels and bottom 3ch channels.

Bug: 185100731
Test: Play wav with 13ch mask after OUT_CHANNEL_COUNT_MAX to 24
Change-Id: I2a620fb1175c6576bead7878315fc48ff5171ddf
1 file changed