Power scrim reveal - adjust for rotation

For foldables, the power button can appear on three different sides
when rotating. Make sure power button reveal scrim comes from wherever
it is.

Apologies - the whole file was formatted but the only part that
changed was in PowerButtonReveal

Fixes: 204737218
Test: manual, use device power button and keep rotating
Change-Id: I1dbd1fd76456ef2c1a7de2847877e3c029176eba