ARM: uniphier: revive some commands lost by Kconfig re-sync

The recently added uniphier_ld20_defconfig missed the tree-wide
re-sync by commit 89cb2b5f8b ("configs: Re-sync with cmd/Kconfig").

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

configs/uniphier_ld20_defconfig

@@ -8,6 +8,7 @@ CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-ld20-ref"
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_XIMG is not set
 # CONFIG_CMD_ENV_EXISTS is not set
+CONFIG_CMD_MMC=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_FPGA is not set
@@ -16,6 +17,7 @@ CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_TIME=y
 # CONFIG_CMD_MISC is not set
+CONFIG_CMD_FAT=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_GPIO_UNIPHIER=y