[Media TTT] Fix a11y focus on receiver icon

Talkback annonces the content description of the icon. View doesn't get
the focus so any icon overlapping with the view can be able to get the
focus.

Fixes: 265616840
Test: Checked UI using adb command adb shell cmd statusbar
media-ttt-chip-receiver CLOSE_TO_SENDER useAppIcon=true.

Change-Id: I46db3839e9384ee88cdfe3e0de2bea5d8e384429