Bluetooth: Use macros for L2CAP channel identifiers

Use macros instead of hardcoded numbers to make the L2CAP source code
more readable.

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 f566aa1..ed4ba91 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -106,6 +106,12 @@
 	__le16     status;
 } __attribute__ ((packed));
 
+/* channel indentifier */
+#define L2CAP_CID_SIGNALING	0x0001
+#define L2CAP_CID_CONN_LESS	0x0002
+#define L2CAP_CID_DYN_START	0x0040
+#define L2CAP_CID_DYN_END	0xffff
+
 /* connect result */
 #define L2CAP_CR_SUCCESS    0x0000
 #define L2CAP_CR_PEND       0x0001