usb: gadget: mv_udc: don't check CONFIG_USB_MAX_CONTROLLER_COUNT

i.mx6 has 1 otg controller, and 3 host ports. So,
CONFIG_USB_MAX_CONTROLLER_COUNT can be greater than 1
even though only 1 device mode controller is supported.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c
index 83bd075..e330bbd 100644
--- a/drivers/usb/gadget/mv_udc.c
+++ b/drivers/usb/gadget/mv_udc.c
@@ -17,10 +17,6 @@
 #include <linux/types.h>
 #include <usb/mv_udc.h>
 
-#if CONFIG_USB_MAX_CONTROLLER_COUNT > 1
-#error This driver only supports one single controller.
-#endif
-
 /*
  * Check if the system has too long cachelines. If the cachelines are
  * longer then 128b, the driver will not be able flush/invalidate data