add option to pass symbol defines to ci build.py

add build.args option for hil json
add MAX3421_HOST=1 for metro m4 express

tools/get_deps.py

@@ -286,6 +286,7 @@ def main():
     parser = argparse.ArgumentParser()
     parser.add_argument('families', nargs='*', default=[], help='Families to fetch')
     parser.add_argument('-b', '--board', action='append', default=[], help='Boards to fetch')
+    parser.add_argument('-D', '--define', action='append', default=[], help='Have no effect')
     parser.add_argument('-f1', '--build-flags-on', action='append', default=[], help='Have no effect')
     parser.add_argument('--print', action='store_true', help='Print commit hash only')
     args = parser.parse_args()