[Media TTT] Update chip states to not require otherDeviceName if they

don't need it. Define a #getChipTextString method instead.

Bug: 203800643
Bug: 203800347
Test: verify all states still trigger via adb
Test: media.taptotransfer tests
Change-Id: Iba8a67a0a8affc4857fafdaf1880b920db0a3fe1