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/secomx6quq7_defconfig b/configs/secomx6quq7_defconfig
index aa5b3bb..917001e 100644
--- a/configs/secomx6quq7_defconfig
+++ b/configs/secomx6quq7_defconfig
@@ -5,3 +5,4 @@
 CONFIG_SECOMX6Q=y
 CONFIG_SECOMX6_2GB=y
 CONFIG_SYS_EXTRA_OPTIONS="ENV_IS_IN_MMC"
+CONFIG_CMD_SETEXPR=y