usb: mv_udc: Unbreak the mv_udc driver

The mv_udc driver is broken for a while and doesn't even compile.
This patch fixes the issues and gets the driver into working state
again. This driver was tested on Freescale i.MX233/i.MX28 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Lei Wen <leiwen@marvell.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/serial/usbtty.h b/drivers/serial/usbtty.h
index bbabb32..e243a8e 100644
--- a/drivers/serial/usbtty.h
+++ b/drivers/serial/usbtty.h
@@ -22,6 +22,8 @@
 #include <usb/pxa27x_udc.h>
 #elif defined(CONFIG_DW_UDC)
 #include <usb/designware_udc.h>
+#elif defined(CONFIG_MV_UDC)
+#include <usb/mv_udc.h>
 #endif
 
 #include <version.h>