[Media TTT] Set specific touchable regions for the media chips so that

other touches will get correctly passed through to the window below.

Fixes: 249639836
Fixes: 249632655
Test: manual: On lockscreen, display media sender chip then verify you
can swipe down to open QS
Test: manual: On homescreen, display media receiver chip then verify you
can swipe up to see recent apps
Test: manual: verify you can still click the Undo button on the
"Transfer succeeded" chip
Test: atest SystemUITests

Change-Id: Idce510fc5b4e0c5ccd74d2b56e1d23db183ebe69