Group media and QQS in SingleShade

This allows to expand them together. Also, it simplifies
SingleShadeMeasurePolicy.

Drive by fix of media additional actions element: use the debugName as
the identity so they actually can be matched.

Test: manual, media in portrait and landscape
Fixes: 439628547
Flag: com.android.systemui.scene_container
Change-Id: Ida1e11a7c2a242ce755b75bd82219f2c01ffa314