Use ScopedAHardwareBufferFenceSync for overlays instead of GLImage

On Android we used fake GLImages to provide it for overlays, but the
only function that was called on that image is GetAHardwareBuffer().

This CL passes ScopedAHardwareBufferFenceSync to ScheduleOverlayPlane
and unsubclasses our fake images from GLImage. Further cleanup is
possible, but it's more tricky due to how we work with fences, so it
will be done in follow-ups.

Bug: 1366810
Change-Id: Ic885c0a772c13be192156a6e84c9e57cc0168ef6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3989429
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1065010}