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/pico-dwarf-imx6ul_defconfig b/configs/pico-dwarf-imx6ul_defconfig
index 77208a3..3b84ae8 100644
--- a/configs/pico-dwarf-imx6ul_defconfig
+++ b/configs/pico-dwarf-imx6ul_defconfig
@@ -23,7 +23,7 @@
 CONFIG_BOOTCOMMAND="run findfdt; run finduuid; run distro_bootcmd"
 CONFIG_DEFAULT_FDT_FILE="imx6ul-pico-dwarf.dtb"
 CONFIG_BOARD_EARLY_INIT_F=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_BOOTMENU=y