usb: Move SPL_USB_STORAGE Kconfig symbol to drivers/usb/

To avoid piling up all the various Kconfig symbols in one place, i.e.
common/spl/Kconfig, move the USB Kconfig symbols into drivers/usb/ .
This commit moves SPL_USB_STORAGE and matching SYS_USB_FAT_BOOT_PARTITION .

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 03d0fd9..5ad29af 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1345,23 +1345,6 @@
 	  automatic power-off when the temperature gets too high or low. Other
 	  devices may be discrete but connected on a suitable bus.
 
-config SPL_USB_STORAGE
-	bool "Support loading from USB"
-	depends on SPL_USB_HOST
-	help
-	  Enable support for USB devices in SPL. This allows use of USB
-	  devices such as hard drives and flash drivers for loading U-Boot.
-	  The actual drivers are enabled separately using the normal U-Boot
-	  config options. This enables loading from USB using a configured
-	  device.
-
-config SYS_USB_FAT_BOOT_PARTITION
-	int "Partition on USB to use to load U-Boot from"
-	depends on SPL_USB_STORAGE
-	default 1
-	help
-	  Partition on the USB storage device to load U-Boot from
-
 config SPL_USB_GADGET
 	bool "Suppport USB Gadget drivers"
 	help
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 94fb32d..a972d87 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -126,6 +126,28 @@
 	  value = 1s because some usb device needs around 1.5s to be initialized
 	  and a 2s value should solve detection issue on problematic USB keys.
 
+if SPL_USB_HOST
+
+comment "USB peripherals in SPL"
+
+config SPL_USB_STORAGE
+	bool "Support loading from USB"
+	help
+	  Enable support for USB devices in SPL. This allows use of USB
+	  devices such as hard drives and flash drivers for loading U-Boot.
+	  The actual drivers are enabled separately using the normal U-Boot
+	  config options. This enables loading from USB using a configured
+	  device.
+
+config SYS_USB_FAT_BOOT_PARTITION
+	int "Partition on USB to use to load U-Boot from"
+	depends on SPL_USB_STORAGE
+	default 1
+	help
+	  Partition on the USB storage device to load U-Boot from.
+
+endif
+
 if USB_KEYBOARD
 
 config USB_KEYBOARD_FN_KEYS