runqemu takes cli extra args as well

runqemu

@@ -33,6 +33,8 @@ while getopts a:dkn OPT; do
       ;;
   esac
 done
+shift "$(($OPTIND - 1))"
+extra_flags="$extra_flags $@"
 
 images_dir='buildroot/output/images'
 case "$arch" in