Merge "audio flinger: fix initial mmap stream volume" into main am: e3f46d5b am: c6af235d

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2829082



Change-Id: I3d73634cc69149dfa4b3d81bbef7b5400955ab85
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>