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/rpi_2_defconfig b/configs/rpi_2_defconfig
index a26f767..bda4e95 100644
--- a/configs/rpi_2_defconfig
+++ b/configs/rpi_2_defconfig
@@ -18,5 +18,7 @@
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_USB=y
+CONFIG_USB_STORAGE=y
 CONFIG_PHYS_TO_BUS=y
 CONFIG_OF_LIBFDT=y