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/mx53evk_defconfig b/configs/mx53evk_defconfig
index 2c54942..eed381b 100644
--- a/configs/mx53evk_defconfig
+++ b/configs/mx53evk_defconfig
@@ -11,5 +11,6 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_DATE=y
 CONFIG_CMD_FAT=y
 CONFIG_OF_LIBFDT=y