mx28 / mx51: Drop CMD_DATE

These use pre-driver model code and it is several years since the
migration deadline. Disable the 'date' command so that this old code can
be removed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/mx28evk_defconfig b/configs/mx28evk_defconfig
index 1fe68ef..dddb57e 100644
--- a/configs/mx28evk_defconfig
+++ b/configs/mx28evk_defconfig
@@ -32,7 +32,6 @@
 CONFIG_CMD_NAND_TRIMFFS=y
 CONFIG_CMD_USB_MASS_STORAGE=y
 CONFIG_CMD_CACHE=y
-CONFIG_CMD_DATE=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
diff --git a/configs/mx51evk_defconfig b/configs/mx51evk_defconfig
index e5178fb..5932a15 100644
--- a/configs/mx51evk_defconfig
+++ b/configs/mx51evk_defconfig
@@ -31,7 +31,6 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
-CONFIG_CMD_DATE=y
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_OVERWRITE=y