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/configs/imx7_cm_defconfig b/configs/imx7_cm_defconfig
index 6220ebf..28836c2 100644
--- a/configs/imx7_cm_defconfig
+++ b/configs/imx7_cm_defconfig
@@ -25,7 +25,7 @@
 CONFIG_DEFAULT_FDT_FILE="ask"
 # CONFIG_BOARD_EARLY_INIT_F is not set
 CONFIG_SPL_I2C_SUPPORT=y
-CONFIG_SPL_USB_HOST_SUPPORT=y
+CONFIG_SPL_USB_HOST=y
 CONFIG_SPL_USB_GADGET=y
 CONFIG_SPL_USB_SDP_SUPPORT=y
 # CONFIG_CMD_BOOTD is not set