Fixing media player clipped in shade in large screen portrait

Removing `pinToBottom` and `updateMediaPositions` functions which seem like they’re not needed anymore as `MediaHierarchyManager` is managing transition between QS and QQS. At the same time - as position of media player is managed from two different places at the same time - it’s causing weird vertical path with media player going too much down only to go back up at the end of the motion.

Fixes: 220869154
Test: on large screen portrait with media playing go to shade, expand QS and see media player is not clipped during the motion
Change-Id: If83c358bf5e4813398c3f2f24a52ec01c0e85499