[Chipbar] Replace the media-specific logger with a generic

TemporaryViewLogger.

Also add a log for chip addition, since we already had one for chip
removal.

Test: verify MediaTttSender and MediaTttReceiver log buffers still work
Test: systemui.temporarydisplay tests
Test: systemui.media.taptotransfer tests
Change-Id: Idb29d25de75c1a96c533b230d0f7d4286f777ba4