Bluetooth: Adds set_default function in L2CAP setup

Some parameters in L2CAP chan are set to default similar way in
socket based channels and A2MP channels. Adds common function which
sets all defaults.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 1d3e9c3..ae1d78ee 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1006,12 +1006,8 @@
 		} else {
 			chan->mode = L2CAP_MODE_BASIC;
 		}
-		chan->max_tx = L2CAP_DEFAULT_MAX_TX;
-		chan->fcs  = L2CAP_FCS_CRC16;
-		chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
-		chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
-		chan->sec_level = BT_SECURITY_LOW;
-		set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
+
+		l2cap_chan_set_defaults(chan);
 	}
 
 	/* Default config options */