arm: mvebu: theadorable_debug_defconfig: Enable setexpr command

The setexpr command is useful for scripting, lets enable it for this
platform.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/theadorable_debug_defconfig b/configs/theadorable_debug_defconfig
index 75d592e..863d6ce 100644
--- a/configs/theadorable_debug_defconfig
+++ b/configs/theadorable_debug_defconfig
@@ -26,7 +26,6 @@
 CONFIG_CMD_SF=y
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
-# CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y