Merge "libhwc2.1: keep vblank enabled for at least the next TE" into tm-qpr-dev am: 43e0cc51ee

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/google/graphics/common/+/20608290

Change-Id: Id12e1e59fa57998ade1f13206f4576829d6ef3b9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>