hwc2: add locks for callback functions am: ccf7cd3bf2 am: 3be6da93f1 am: cd2949ce5d

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/qcom/display/+/11837780

Change-Id: Ic7955e311a4f04c1937c925d37d235253988caa0