unit/test-avrcp: Add /TP/MCN/CB/BV-06-C test
unit/test-avrcp: Add /TP/MCN/CB/BV-06-C test

To verify the ChangePath response issued by the TG when the Direction is
FolderUp.

ComputeCycles/bluez,ComputeCycles/bluez,pkarasev3/bluez,silent-snowman/bluez,ComputeCycles/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,silent-snowman/bluez,pkarasev3/bluez,pkarasev3/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,ComputeCycles/bluez,pkarasev3/bluez,mapfau/bluez