audio/avrcp: Add GetFolderItems support

Support added to handle Get Folder Items browsing PDU
for media player scope in TG role.

e.g.
      AVCTP Browsing: Response: type 0x00 label 0 PID 0x110e
        AVRCP: GetFolderItems: len 0x0030
          Status: 0x04 (Success)
          UIDCounter: 0x0000 (0)
          NumOfItems: 0x0001 (1)
          Item: 0x01 (Media Player)
          Length: 0x0028 (40)
          PlayerID: 0x0000 (0)
          PlayerType: 0x0001 (Audio)
          PlayerSubType: 0x00000001 (Audio Book)
          PlayStatus: 0x01 (PLAYING)
          Features: 0x0000000000000007FFF0007000000000
          CharsetID: 0x006a (UTF-8)
          NameLength: 0x000c (12)
          Name: SimplePlayer
3 files changed