usb: add HAS_IOMEM dependency to USB_C67X00_HCD

  CC      drivers/usb/c67x00/c67x00-drv.o
drivers/usb/c67x00/c67x00-drv.c: In function ‘c67x00_drv_probe’:
drivers/usb/c67x00/c67x00-drv.c:148:2: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
  c67x00->hpi.base = ioremap(res->start, resource_size(res));
  ^
drivers/usb/c67x00/c67x00-drv.c:148:19: warning: assignment makes pointer from integer without a cast [enabled by default]
  c67x00->hpi.base = ioremap(res->start, resource_size(res));
                   ^
drivers/usb/c67x00/c67x00-drv.c:185:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
  iounmap(c67x00->hpi.base);
  ^
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/Kconfig

@@ -5,6 +5,7 @@ comment "USB Host Controller Drivers"
 
 config USB_C67X00_HCD
 	tristate "Cypress C67x00 HCD support"
+	depends on HAS_IOMEM
 	help
 	  The Cypress C67x00 (EZ-Host/EZ-OTG) chips are dual-role
 	  host/peripheral/OTG USB controllers.