kbuild: add generic --set-str option to scripts/config

Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/config

@@ -9,8 +9,10 @@ config options command ...
 commands:
 	--enable|-e option   Enable option
 	--disable|-d option  Disable option
-	--module|-m option      Turn option into a module
-	--state|-s option       Print state of option (n,y,m,undef)
+	--module|-m option   Turn option into a module
+	--set-str option value
+	                     Set option to "value"
+	--state|-s option    Print state of option (n,y,m,undef)
 
 	--enable-after|-E beforeopt option
                              Enable option directly after other option
@@ -102,6 +104,11 @@ while [ "$1" != "" ] ; do
 		set_var "CONFIG_$ARG" "CONFIG_$ARG=m"
 		;;
 
+	--set-str)
+		set_var "CONFIG_$ARG" "CONFIG_$ARG=\"$1\""
+		shift
+		;;
+
 	--state|-s)
 		if grep -q "# CONFIG_$ARG is not set" $FN ; then
 			echo n