ARM: uniphier: enable CONFIG_CMD_FS_GENERIC

Enable file system commands such as load, ls.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_pro4_defconfig b/configs/uniphier_pro4_defconfig
index a00e583..72bd99a 100644
--- a/configs/uniphier_pro4_defconfig
+++ b/configs/uniphier_pro4_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_TIME=y
 # CONFIG_CMD_MISC is not set
 CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
 # CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_NET_RANDOM_ETHADDR=y