ARM: uniphier: enable CONFIG_CMD_UBI

Now that CONFIG_SYS_MONITOR_LEN increased, we have room for enabling
more options again.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_v7_defconfig b/configs/uniphier_v7_defconfig
index fc33b72..1b7bd5b 100644
--- a/configs/uniphier_v7_defconfig
+++ b/configs/uniphier_v7_defconfig
@@ -26,6 +26,7 @@
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=uniphier-nand.0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=uniphier-nand.0:1m(firmware),-(UBI)"
+CONFIG_CMD_UBI=y
 # CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-pxs2-vodka"