cmd: add Kconfig option for 'date' command

Signed-off-by: Chris Packham <judge.packham@gmail.com>
[trini: default y if DM_RTC, re-sync]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/malta_defconfig b/configs/malta_defconfig
index bcb41e0..237b3ab 100644
--- a/configs/malta_defconfig
+++ b/configs/malta_defconfig
@@ -12,6 +12,7 @@
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_PING=y
+CONFIG_CMD_DATE=y
 # CONFIG_ISO_PARTITION is not set
 CONFIG_OF_EMBED=y
 CONFIG_MTD_NOR_FLASH=y