Bluetooth: Use macro for L2CAP hint mask on receiving config request

Using the L2CAP_CONF_HINT macro is easier to understand than using a
hardcoded 0x80 value.

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index ed4ba91..300b63f 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -149,6 +149,8 @@
 } __attribute__ ((packed));
 #define L2CAP_CONF_OPT_SIZE	2
 
+#define L2CAP_CONF_HINT		0x80
+
 #define L2CAP_CONF_MTU		0x01
 #define L2CAP_CONF_FLUSH_TO	0x02
 #define L2CAP_CONF_QOS		0x03