ARM: uniphier: enable CONFIG_CMD_CACHE

This will be useful, for example, to load firmware to DRAM and make
it visible to other agents.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_ld20_defconfig b/configs/uniphier_ld20_defconfig
index 7623381..d6443fd 100644
--- a/configs/uniphier_ld20_defconfig
+++ b/configs/uniphier_ld20_defconfig
@@ -15,6 +15,7 @@
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y
 # CONFIG_CMD_MISC is not set
 CONFIG_CMD_FAT=y