[automerger skipped] libaudiohal: Respect channel count when setting hw gain am: b537e909 -s ours

am skip reason: Merged-In Ic4179d41d569231255f9e497032d369df19ec6ba with SHA-1 222fdf95 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/26705895



Change-Id: Ib64a55807689c3e44c84138c8ed360639c204fb2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>