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/common/Kconfig b/common/Kconfig
index 5b8b0c3..2e3b8c0 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -252,6 +252,14 @@
 	help
 	  Run script from memory
 
+config CMD_SETEXPR
+	bool "setexpr"
+	help
+	  Evaluate boolean and math expressions and store the result in an env
+	    variable.
+	  Also supports loading the value at a memory location into a variable.
+	  If CONFIG_REGEX is enabled, setexpr also supports a gsub function.
+
 endmenu
 
 menu "Network commands"