HAL_F4Light: fixed tool scripts

libraries/AP_HAL_F4Light/support/UPDATE_OSD.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+set -x
+
+pushd minimosd-extra/
+git checkout -f master
+git fetch origin
+git reset --hard origin/master
+popd
+
+# git diff # this should show a change to git hash of OSD
+git add minimosd-extra
+git commit -m 'HAL_F4Light: updated OSD submodule'
+