PTS test for AVRCP Player Settings Changed

AVRCP/TG/NFY/BV-03-C ICS: 7_30
Added functions to start/stop mp3 playback, that is required to play
during changing of the shuffle mode.

Test: atest pts-bot:AVRCP
Bug: 259590659
Change-Id: I2f172d6694b6aaa1c55885d13e3d770d487e790f