LE Audio: Warn when MCP commands are ignored due to AUTH errors

Currently, when LE Audio profile is started, it would instruct MCP that
remote device can send media control commands.
If such commands was to be ignored, we should log that, so we know we
need to take actions to fix it.

Bug: 249164851
Change-Id: Ic6124f7db7296be06d6537a41dcf3ce249f5f232