ARM: uniphier: enable CONFIG_CMD_CONFIG

This command is useful to see which config options are enabled on
the running U-Boot image.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_ld20_defconfig b/configs/uniphier_ld20_defconfig
index 7e3ff5c..6251359 100644
--- a/configs/uniphier_ld20_defconfig
+++ b/configs/uniphier_ld20_defconfig
@@ -10,6 +10,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CONFIG=y
 # CONFIG_CMD_XIMG is not set
 # CONFIG_CMD_ENV_EXISTS is not set
 CONFIG_CMD_GPT=y