usb: add HAS_IOMEM dependency to USB_PXA25X

drivers/built-in.o: In function `pxa_udc_probe':
/home/vegard/linux/drivers/usb/gadget/udc/pxa27x_udc.c:2430: undefined reference to `devm_ioremap_resource'
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/Kconfig

@@ -128,6 +128,7 @@ config USB_OMAP
 config USB_PXA25X
 	tristate "PXA 25x or IXP 4xx"
 	depends on (ARCH_PXA && PXA25x) || ARCH_IXP4XX
+	depends on HAS_IOMEM
 	help
 	   Intel's PXA 25x series XScale ARM-5TE processors include
 	   an integrated full speed USB 1.1 device controller.  The