[Chipbar] Rename MediaTttChipControllerSender to ChipbarCoordinator,
since it has all the chipbar logic.

Future CLs will remove the media-specific logic from ChipbarCoordinator.

Bug: 245610654
Test: manual: Verify chipbar commands still work
Test: media.taptotransfer tests
Test: temporarydisplay tests
Change-Id: I0af8480c9ee400496237f144aaba907ab5a99e30
12 files changed