dm9601: add support for dm9621a based dongle

dm9621a is functionally identical to dm9620, so the existing handling can
directly be used.

Thanks to Davicom for sending me a dongle.
Signed-off-by: NPeter Korsgaard <peter@korsgaard.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/dm9601.c

@@ -594,6 +594,10 @@ static const struct usb_device_id products[] = {
 	 USB_DEVICE(0x0a46, 0x9620),	/* DM9620 USB to Fast Ethernet Adapter */
 	 .driver_info = (unsigned long)&dm9601_info,
 	 },
+	{
+	 USB_DEVICE(0x0a46, 0x9621),	/* DM9621A USB to Fast Ethernet Adapter */
+	 .driver_info = (unsigned long)&dm9601_info,
+	},
 	{},			// END
 };