Move win.skipLayout into policy.layoutWindowLw

This CL restore the previous logic to skip layout but still update
mLayoutSeq. In this way, we can still report resized to the client.

Fix: 207144283
Test: atest PinnedStackTests#testTranslucentActivityOnTopOfPinnedTask
Change-Id: I5a4a09899fef194d002a7e74bc4ad64685d4e689