usb: Rename SPL_USB_SUPPORT to SPL_USB_STORAGE

Since there is the SPL_USB_HOST_SUPPORT for enabling USB support in SPL,
makes more sense to rename the SPL_USB_SUPPORT as SPL_USB_STORAGE.
Everything that is not part of the usb storage support in SPL is now
build under SPL_USB_HOST_SUPPORT.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/am43xx_evm_usbhost_boot_defconfig b/configs/am43xx_evm_usbhost_boot_defconfig
index 5131f19..5bd919b 100644
--- a/configs/am43xx_evm_usbhost_boot_defconfig
+++ b/configs/am43xx_evm_usbhost_boot_defconfig
@@ -14,7 +14,7 @@
 CONFIG_SPL_MTD_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_SPL_USB_HOST_SUPPORT=y
-CONFIG_SPL_USB_SUPPORT=y
+CONFIG_SPL_USB_STORAGE=y
 CONFIG_CMD_SPL=y
 CONFIG_CMD_SPL_NAND_OFS=0x00100000
 CONFIG_CMD_SPL_WRITE_SIZE=0x40000