Merge "hwc2: add locks for callback functions" into rvc-dev am: fbed8adaff am: b5a53e513c am: d0e50d770f

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

Change-Id: I43dc4b1abf8c0ce161468039caeb31dfaab7e647