Rename AUDIO_CHANNEL_OUT_QUAD and AUDIO_CHANNEL_OUT_5POINT1

to AUDIO_CHANNEL_OUT_QUAD_BACK and AUDIO_CHANNEL_OUT_5POINT1_BACK
respectively, for consistency with terminology used in downmix effect

For the time being, preserve the old names to avoid changing existing code.

Change-Id: I11131e3f66087090a590c93921092ca4fc78cf1c
1 file changed