Fix license. Linaro switched years ago to GPL.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/display.h b/display.h
index e3a1529..8882918 100644
--- a/display.h
+++ b/display.h
@@ -1,17 +1,23 @@
-/*******************************************************************************
- * Copyright (C) 2010, Linaro Limited.
+/*
+ * Power debug tool (powerdebug)
  *
- * This file is part of PowerDebug.
+ * Copyright (C) 2016, Linaro Limited.
  *
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
  *
- * Contributors:
- *     Amit Arora <amit.arora@linaro.org> (IBM Corporation)
- *       - initial API and implementation
- *******************************************************************************/
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
 
 enum { CLOCK, REGULATOR, SENSOR, GPIO };