SF rounded corners: include geometry when reordering

Bug: 184729207
Bug: 163076219
Test: TODO

In Id721cd451209ab50e5cd8badf5f3e0917506e728, we started updating
geometry if we had an override buffer, or if the last frame did. Also do
so for a peekThroughLayer, since its blend mode changes. In addition,
the z has changed for layers starting with the peekThroughLayer, so
update geometry for those, too.

Move isPeekingThrough to a local variable and parameter. It does not
need the lifetime of overrideInfo. Add it and zIsOverridden to
writeStateToHWC to ensure we restore the order in HWC when the
peekThroughLayer is no longer needed.

Change-Id: I4b2dda504dc52ec06795a2d2b6236b0472702880