Adding back media resumption

Behind a flag for now, while we work on animation issues and settings
Enable with: adb shell settings put system qs_media_resumption 1

Bug: 156104922
Fixes: 154823185
Fixes: 156256312
Test: manual; atest com.android.systemui.media
Change-Id: I77e3706031da820ea0d49c5dfd17f89ae7fb7db4