Merge "audio.h: Define FCC_1 for single channel count" am: 00151cbab4 am: 4370cdb9e9

Original change: https://android-review.googlesource.com/c/platform/system/media/+/1535840

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I242e5b8a82ab0ece8b067ee6d63a8c65f59aae6d