monitor/a2dp: Decode AAC capabilities

monitor/a2dp: Decode AAC capabilities

> ACL Data RX: Handle 12 flags 0x02 dlen 22                                                                                                                            4.565591
      Channel: 67 len 18 [PSM 25 mode 0] {chan 1}
      AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 4 nosp 0
        Service Category: Media Transport (0x01)
        Service Category: Media Codec (0x07)
          Media Type: Audio (0x00)
          Media Codec: MPEG-2,4 AAC (0x02)
            Object Type: 0xc0
              MPEG-2 AAC LC
              MPEG-4 AAC LC
            Frequency: 0x180
              44100
              48000
            Channels: 0x0c
              1
              2
            Bitrate: 320000bps
            VBR: Yes
        Service Category: Content Protection (0x04)
          Content Protection Type: SCMS-T (0x0002)