arm: mvebu: helios4_defconfig: enable setexpr command

Update the helios4 defconfig to enable the 'setexpr' command, which is a
default and useful for various complex boot-scripts.

Signed-off-by: Josua Mayer <josua@solid-run.com>
diff --git a/configs/helios4_defconfig b/configs/helios4_defconfig
index f4f5db6..72d1d77 100644
--- a/configs/helios4_defconfig
+++ b/configs/helios4_defconfig
@@ -43,7 +43,6 @@
 CONFIG_CMD_PCI=y
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
-# CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y