Rename SPL_USB_HOST_SUPPORT to SPL_USB_HOST

Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index 05785fc..35b6149 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -41,7 +41,7 @@
 
 config SPL_USB_CDNS3_HOST
 	bool "Cadence USB3 host controller"
-	depends on USB_XHCI_HCD && SPL_USB_HOST_SUPPORT
+	depends on USB_XHCI_HCD && SPL_USB_HOST
 	help
 	  Say Y here to enable host controller functionality of the
 	  Cadence driver.