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

@@ -10,6 +10,8 @@ commands:
 	--enable|-e option   Enable option
 	--disable|-d option  Disable option
 	--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
@@ -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