util/lint: Add test for documentation in util dirs

Make sure that any new directories added to the util directory
get documentation added.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I8bb415c72cf05b91c84f0a945d7767134a74c44c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48967
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/lint/lint-stable-025-description-md

@@ -0,0 +1,16 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# DESCR: Check that every utility has a description
+
+LC_ALL=C export LC_ALL
+FAIL=0
+
+for i in util/*/; do
+    if [ ! -r "$i/description.md" ]; then
+      echo "  Failure: util directory $i missing description.md file."
+      FAIL=1
+    fi
+done
+
+exit $FAIL