[XTENSA] Remove Copyright notes. They contradict GPL license.

#	<xtensa_root>/src/xtensa-config-overlay.tar.gz

#  where <xtensa_root> is the path to the Tensilica Core Package.

#

# Copyright (c) 2003-2008 by Tensilica Inc.  ALL RIGHTS RESERVED.

# These coded instructions, statements, and computer programs are the

# copyrighted works and confidential proprietary information of Tensilica Inc.

# They may not be modified, copied, reproduced, distributed, or disclosed to

# third parties in any manner, medium, or form, in whole or in part, without

# the prior written consent of Tensilica Inc.

#

# Copyright (c) 2003-2009 by Tensilica Inc.

#  History:

#  2007-NOV-08	1.0	meg	Initial version

#  2007-NOV-21	1.1	meg	Add -k parameter