[automerger skipped] Camera: Remove an unused variable mCameraMuteChanged in...

[automerger skipped] Camera: Remove an unused variable mCameraMuteChanged in Camera3Device am: 845f2b34 -s ours am: 4501fea2 -s ours

am skip reason: Merged-In I0e8dc10cda56a93e4776781ca302aabc4cf4b4da with SHA-1 f2eded32 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2696794



Change-Id: Id3e64a40a280e80fadd87dfbb8aa337103fc8880
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>