Merge "hwc2: add locks for callback functions" into rvc-dev am: fbed8adaff am: b5a53e513c

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/qcom/sdm845/display/+/11837781

Change-Id: Idd103ae2ac9b1232b48e869ae16849da21e7f4fe