Enable logging for AVRCP Metadata changes

We're seeing a lot of AVRCP metadata issues, so enable some logging of
metadata in hopes of collecting more information.

Bug: 26837775
Bug: 27153373
Bug: 27178384
Bug: 27745277
Change-Id: Ie425ad2a5e090aa4363dab6b853479eeda35cef6
1 file changed