usb: add HAS_IOMEM dependency to USB_NET2272

drivers/usb/gadget/udc/net2272.c: In function ‘net2272_remove’:
drivers/usb/gadget/udc/net2272.c:2232:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
  iounmap(dev->base_addr);
  ^
drivers/usb/gadget/udc/net2272.c: In function ‘net2272_plat_probe’:
drivers/usb/gadget/udc/net2272.c:2650:2: error: implicit declaration of function ‘ioremap_nocache’ [-Werror=implicit-function-declaration]
  dev->base_addr = ioremap_nocache(base, len);
  ^
drivers/usb/gadget/udc/net2272.c:2650:17: warning: assignment makes pointer from integer without a cast [enabled by default]
  dev->base_addr = ioremap_nocache(base, len);
                 ^

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 753c29b..ca19f6f 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -287,6 +287,7 @@
 	   dynamically linked module called "fsl_qe_udc".
 
 config USB_NET2272
+	depends on HAS_IOMEM
 	tristate "PLX NET2272"
 	help
 	  PLX NET2272 is a USB peripheral controller which supports