Adding submodule update script for FPGA tools.

scripts/init-fpga.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# exit script if any command fails
+set -e
+set -o pipefail
+
+# Enable submodule update for FPGA tools.
+git config --unset submodule.fpga/fpga-shells.update
+# Initialize local FPGA tools.
+git submodule update --init --recursive fpga/fpga-shells
+# Disable submodule update for FPGA tools.
+git config submodule.fpga/fpga-shells.update none