Change the screen resolution will cause re-layout the screen, so the focus will back to the first view. Before we actually set the screen
resolution, send an event to the AccessibilityManager and set what it
should say when the user selects the unselect option. Therefore TB will
say "selected" before the screen refreshes.
bug: 229352892
Test: Enable/disable Talkback and check RRS app behaivor. It should read
"selected" after user choose one un-selected option.
Change-Id: If14ed3685f85962d4e4b1d4961216c6ca5d5f0f8
fc3f25c8b5