SurfaceView: Careful with FLAG_PRESERVE_GEOMETRY.

We need to be careful about stripping FLAG_PRESERVE_GEOMETRY
as it breaks render thread sync. Notably we don't need
to strip it in the case of mUpdateWindowNeeded, this just signals
that Window#resized has been called, or something similar, but if there
has been no actual size change, then we can leave the geometry to
the render thread. This particularly manifests in rotation scenarios
where the SurfaceView will receive resize ahead of the app receiving
a configuration change.

Bug: 28823590
Change-Id: Ie2bbe7d9bd9f0a5ab64a08776bae7344eaecb605