Added Focus Outline To QS Tiles

Implemented new focus states for QS Tiles according to UI Specs:
go/qs-tiles-focus-state

Test: Manual, Tab to focus on qs tiles in shade -> ensure rectangular
outline consistent with UI specs in go/qs-tiles-focus-state
Flag: ACONFIG com.android.systemui.qs_tile_focus_state DISABLED
Fixes: 312899524

Change-Id: Ib090b7ab6f47931b1382f4bd8578c62c6f24c15b