USB: add SeaLevel 2106 SeaLINK support to ftdi_sio

We have a couple of these USB-Serial converters around; they're slightly
different from the 2104 models in that they can handle 500Kb/sec over RS422.
The existing ftdi driver seems to work just fine if we add in the 
appropriate IDs.

Patch is against 2.6.17.6, but should apply cleanly to pretty much 
anything recent.

From: Justin Carlson <justinca@qatar.cmu.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/ftdi_sio.c

@@ -344,6 +344,7 @@ static struct usb_device_id id_table_combined [] = {
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
+	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2106_PID) },
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },

drivers/usb/serial/ftdi_sio.h

@@ -111,6 +111,7 @@
 #define SEALEVEL_2102_PID	0x2102	/* SeaLINK+485 (2102) */
 #define SEALEVEL_2103_PID	0x2103	/* SeaLINK+232I (2103) */
 #define SEALEVEL_2104_PID	0x2104	/* SeaLINK+485I (2104) */
+#define SEALEVEL_2106_PID	0x9020	/* SeaLINK+422 (2106) */
 #define SEALEVEL_2201_1_PID	0x2211	/* SeaPORT+2/232 (2201) Port 1 */
 #define SEALEVEL_2201_2_PID	0x2221	/* SeaPORT+2/232 (2201) Port 2 */
 #define SEALEVEL_2202_1_PID	0x2212	/* SeaPORT+2/485 (2202) Port 1 */