[Bluetooth] Add missing entry for the HIDP support

This small patch adds the missing entry about the HIDP support
to the main Kconfig file of the Bluetooth subsystem.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/Kconfig

@@ -20,6 +20,7 @@ menuconfig BT
 	     RFCOMM Module (RFCOMM Protocol)  
 	     BNEP Module (Bluetooth Network Encapsulation Protocol)
 	     CMTP Module (CAPI Message Transport Protocol)
+	     HIDP Module (Human Interface Device Protocol)
 
 	  Say Y here to compile Bluetooth support into the kernel or say M to
 	  compile it as module (bluetooth).