Recompute visible regions more vigorously

Some of the code in latchBuffer was calling invalidateHwcGeometry,
but that didn't cause the SurfaceFlinger visible region code to
re-evaluate the layer's visibility.  Set the recomputeVisibleRegions
"out" parameter instead.

Bug 7235797

Change-Id: If6ba33fbd1a594cd64cc5253aebf752d6ceda1c9