Fix hearing device tile not focusable wiht TalkBack issue

Small size hearing device tile is not focusable when using TalkBack navigation because of the lack of content description and state description.
Add these description to fix the issue.

Flag: EXEMPT bugfix
Bug: 419155829
Test: atest HearingDevicesTileTest
Test: manually test with TalkBack on, attached screenshot on the bug
Change-Id: I3462c33c4a0f2d77269b2cf9ebcd5c9fd1e52888