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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9d6387e9d46a07df49fe8e6c5752fb2f0bd37c12