Keep ControlsActivity on orientation change

When the orientation changes, we need to do one of two things:
* relayout the controls if showing SystemUI controls, or
* tell the TaskView that its location has changed.

We don't need to recreate the activity nor hide and reinflate
everything.

Test: manual with both panel and API apps
Test: atest com.android.systemui.controls
Fixes: 270583496

Change-Id: Ied2d96e237f96658d2274d2de869d3fb05049ebd