[automerger skipped] Revert "Add synchronized lock for ringback playing...

[automerger skipped] Revert "Add synchronized lock for ringback playing start/stop request to avoid" am: a485ff8e am: 4c33fa57 -s ours

am skip reason: Merged-In I143081557957f961a58fd3c1e0518f6a4af738d9 with SHA-1 d4148cc1 is already in history. Merged-In was found from reverted change.

Reverted change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22304956

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22359847



Change-Id: Iff691648bb98ee75609d0d59ddba29a889c74e5a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>