monitor/att: Add decoding support for CCC

monitor/att: Add decoding support for CCC

This adds decoding support for CCC so its value can be decoded:

< ACL Data TX: Handle 3585 flags 0x00 dlen 7
      ATT: Read Request (0x0a) len 2
        Handle: 0x002c Type: Client Characteristic Configuration (0x2902)
> ACL Data RX: Handle 3585 flags 0x02 dlen 6
      ATT: Read Response (0x0b) len 1
        Value: 01
            Notification (0x01)
< ACL Data TX: Handle 3585 flags 0x00 dlen 9
      ATT: Write Request (0x12) len 4
        Handle: 0x002c Type: Client Characteristic Configuration (0x2902)
          Data: 0100
            Notification (0x01)

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>