configs: Migrate CONFIG_USB_STORAGE

In some cases we were missing CONFIG_USB=y so enable that when needed.

Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mcx_defconfig b/configs/mcx_defconfig
index 2e819e4..feea816 100644
--- a/configs/mcx_defconfig
+++ b/configs/mcx_defconfig
@@ -25,4 +25,5 @@
 CONFIG_USB=y
 CONFIG_USB_ULPI_VIEWPORT_OMAP=y
 CONFIG_USB_ULPI=y
+CONFIG_USB_STORAGE=y
 CONFIG_OF_LIBFDT=y