Bluetooth: HFP HF: SLC Connection send/parse CIND

Part of service level connection initilization. Sending AT+CIND=?
and parsing its response.

< ACL Data TX: Handle 256 flags 0x00 dlen 18                   [hci0] 20.888273
      Channel: 76 len 14 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x09 cr 0 dlci 0x02
         Control: 0xef poll/final 0
         Length: 10
         FCS: 0x40
        41 54 2b 43 49 4e 44 3d 3f 0d 40                 AT+CIND=?.@
> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 20.914998
        Num handles: 1
        Handle: 256
        Count: 1
> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 20.916863
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 142                  [hci0] 20.945835
      Channel: 64 len 138 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x0b cr 1 dlci 0x02
         Control: 0xff poll/final 1
         Length: 1024
         FCS: 0x86
         Credits: 1
        0d 0a 2b 43 49 4e 44 3a 20 28 22 63 61 6c 6c 22  ..+CIND: ("call"
        2c 28 30 2c 31 29 29 2c 28 22 63 61 6c 6c 73 65  ,(0,1)),("callse
        74 75 70 22 2c 28 30 2d 33 29 29 2c 28 22 73 65  tup",(0-3)),("se
        72 76 69 63 65 22 2c 28 30 2d 31 29 29 2c 28 22  rvice",(0-1)),("
        73 69 67 6e 61 6c 22 2c 28 30 2d 35 29 29 2c 28  signal",(0-5)),(
        22 72 6f 61 6d 22 2c 28 30 2c 31 29 29 2c 28 22  "roam",(0,1)),("
        62 61 74 74 63 68 67 22 2c 28 30 2d 35 29 29 2c  battchg",(0-5)),
        28 22 63 61 6c 6c 68 65 6c 64 22 2c 28 30 2d 32  ("callheld",(0-2
        29 29 0d 0a 86                                   ))...
> ACL Data RX: Handle 256 flags 0x02 dlen 14                   [hci0] 20.947764
      Channel: 64 len 10 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x0b cr 1 dlci 0x02
         Control: 0xef poll/final 0
         Length: 6
         FCS: 0x9a
        0d 0a 4f 4b 0d 0a 9a                             ..OK...

Change-Id: I33126a19641b889f1749b642cbc5e63984d85b6d
Signed-off-by: Sathish Narasimman <sathish.narasimman@intel.com>