USB: gadaget: add Marvell controller support

Signed-off-by: Lei Wen <leiwen@marvell.com>
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index 9bb7e2e..5d7b638 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -150,6 +150,11 @@
 #define	gadget_is_m66592(g)	0
 #endif
 
+#ifdef CONFIG_USB_GADGET_MV
+#define gadget_is_mv(g)        (!strcmp("mv_udc", (g)->name))
+#else
+#define gadget_is_mv(g)        0
+#endif
 
 /*
  * CONFIG_USB_GADGET_SX2
@@ -216,5 +221,7 @@
 		return 0x20;
 	else if (gadget_is_m66592(gadget))
 		return 0x21;
+	else if (gadget_is_mv(gadget))
+		return 0x22;
 	return -ENOENT;
 }