Improve A11y for TV PiP move menu.

Will make the arrow-buttons selectable/clickable if accessibility is
turned on and adds a done button in the center. This allows for better
Talkback announcements and also allows for usage with switch access
since it doesn't depend on a DPAD.

Bug: 219887361
Test: manual - turn on talkback, launch a PiP, open menu and check that
moving the PiP works using the buttons

Change-Id: I1d5e7b37eef97ce36891d6f499ce57d32ff4895b