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_ld4_sld8_defconfig b/configs/uniphier_ld4_sld8_defconfig
index a06e791..7afdd7c 100644
--- a/configs/uniphier_ld4_sld8_defconfig
+++ b/configs/uniphier_ld4_sld8_defconfig
@@ -27,6 +27,7 @@
 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-ld4-ref"