Bluetooth: Fix for Bluetooth SIG test L2CAP/COS/CFD/BV-14-C

This test case is meant to verify that multiple
unknown options is included in the response.

BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part A
page 1057

'On an unknown option failure (Result=0x0003),
the option(s) that contain anoption type field that is not
understood by the recipient of the L2CAP_CONFIGURATION_REQ
packet shall be included in the L2CAP_CONFIGURATION_RSP
packet unless they are hints.'

Before this patch:

> ACL Data RX: Handle 11 flags 0x02 dlen 24
      L2CAP: Configure Request (0x04) ident 18 len 16
        Destination CID: 64
        Flags: 0x0000
        Option: Unknown (0x10) [mandatory]
        10 00 11 02 11 00 12 02 12 00
< ACL Data TX: Handle 11 flags 0x00 dlen 17
      L2CAP: Configure Response (0x05) ident 18 len 9
        Source CID: 64
        Flags: 0x0000
        Result: Failure - unknown options (0x0003)
        Option: Unknown (0x10) [mandatory]
        12

After this patch:

> ACL Data RX: Handle 11 flags 0x02 dlen 24
      L2CAP: Configure Request (0x04) ident 5 len 16
        Destination CID: 64
        Flags: 0x0000
        Option: Unknown (0x10) [mandatory]
        10 00 11 02 11 00 12 02 12 00
< ACL Data TX: Handle 11 flags 0x00 dlen 23
      L2CAP: Configure Response (0x05) ident 5 len 15
        Source CID: 64
        Flags: 0x0000
        Result: Failure - unknown options (0x0003)
        Option: Unknown (0x10) [mandatory]
        10 11 01 11 12 01 12
Signed-off-by: NJimmy Wahlberg <jimmywa@spotify.com>
Reviewed-by: NLuiz Augusto Von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

net/bluetooth/l2cap_core.c

@@ -3633,7 +3633,7 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data
 			if (hint)
 				break;
 			result = L2CAP_CONF_UNKNOWN;
-			*((u8 *) ptr++) = type;
+			l2cap_add_conf_opt(&ptr, (u8)type, sizeof(u8), type, endptr - ptr);
 			break;
 		}
 	}