monitor/avdtp: Decode AVDTP_GET_CAPABILITIES

monitor/avdtp: Decode AVDTP_GET_CAPABILITIES

< ACL Data TX: Handle 256 flags 0x00 dlen 7
      Channel: 258 len 3 [PSM 25 mode 0] {chan 2}
      AVDTP: Get Capabilities (0x02) Command (0x00) type 0x00 label 1 nosp 0
        ACP SEID: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 20
      Channel: 66 len 16 [PSM 25 mode 0] {chan 2}
      AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 1 nosp 0
        Service Category: Media Transport (0x01)
        Service Category: Media Codec (0x07)
        00 00 3f ff 02 35                                ..?..5
        Service Category: Content Protection (0x04)
        02 00                                            ..