[Bluetooth] Update Bluetooth core version number

With all the Bluetooth 2.1 changes and the support for Simple Pairing,
it is important to update the Bluetooth core version number.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/af_bluetooth.c

@@ -49,7 +49,7 @@
 #define BT_DBG(D...)
 #endif
 
-#define VERSION "2.11"
+#define VERSION "2.12"
 
 /* Bluetooth sockets */
 #define BT_MAX_PROTO	8