scripts: Add script to reorder kernel config-* files

This script will reorder the content of all config-* files in the target
folder. It will also remove duplicates. It will not remove options
already defined in the generic configuration.

Link: https://github.com/openwrt/openwrt/pull/16743
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

scripts/kconfig-reorder.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# This script reorders all config-* files in the target directory.
+
+find_files=$(find target -type f -name 'config-*' -print)
+
+if [ -n "$find_files" ]; then
+  for file in $find_files; do
+    echo "Reordering options in $file"
+    LANG=C ./scripts/kconfig.pl '+' "$file" /dev/null > "$file"-new
+    mv "$file"-new "$file"
+  done
+else
+  echo "No files named config-* found."
+fi
+