util: Look for python2 binary instead of python

Make the requirement of python2 explicit in scripts that are incompatible
with python3.

Change-Id: I77f150bdb3aab316fc3c3a21b911db397fa0106f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/13286
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/dtd_parser/dtd_parser.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # dtd_parser.py - DTD structure parser
 #
 # Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.

util/exynos/fixed_cksum.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright (C) 2013 Google Inc.
 #

util/exynos/variable_cksum.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright (C) 2013 Google Inc.
 #

util/ipqheader/ipqheader.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright (c) 2013 The Linux Foundation. All rights reserved.
 #

util/ipqheader/mbncat.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # Copyright (c) 2014, The Linux Foundation. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without

util/mtkheader/gen-bl-img.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 #
 # This file is part of the coreboot project.

util/rockchip/make_idb.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.