audio: adjust the digital gain for speaker-mic am: 1a8281331d

Original change: https://googleplex-android-review.googlesource.com/c/device/google/raviole/+/17899773

Change-Id: Ia5095fd80018fc9a5b9f7ec91408c99d6f27e298
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>