Move setexpr to Kconfig

Another shell scripting command that has not been moved.

Moved using tools/moveconfig.py using these settings:

CMD_SETEXPR bool n y

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/wandboard_defconfig b/configs/wandboard_defconfig
index 1ccac5a..fdb8c6a 100644
--- a/configs/wandboard_defconfig
+++ b/configs/wandboard_defconfig
@@ -1,6 +1,7 @@
-CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,MX6QDL"
 CONFIG_ARM=y
 CONFIG_TARGET_WANDBOARD=y
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,MX6QDL"
+CONFIG_CMD_SETEXPR=y
 CONFIG_DM=y
 CONFIG_DM_THERMAL=y