can: gs_usb: support up to 3 channels per device

Some STM32G3 chips support up to 3 CAN-FD channels, increase number of
supported channels in this driver to 3 accordingly.

Link: https://lore.kernel.org/all/20220309124132.291861-14-mkl@pengutronix.de
Suggested-by: Ryan Edwards <ryan.edwards@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/gs_usb.c

@@ -166,9 +166,9 @@ struct gs_host_frame {
 /* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
 #define GS_MAX_RX_URBS 30
 /* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 2 interfaces. The future may vary.
+ * Current hardware only supports 3 interfaces. The future may vary.
  */
-#define GS_MAX_INTF 2
+#define GS_MAX_INTF 3
 
 struct gs_tx_context {
 	struct gs_can *dev;