x86/microcode/AMD: Update copyright

Adjust copyright.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20181107170218.7596-17-bp@alien8.de

arch/x86/kernel/cpu/microcode/amd.c

@@ -5,7 +5,7 @@
  *  CPUs and later.
  *
  *  Copyright (C) 2008-2011 Advanced Micro Devices Inc.
- *	          2013-2016 Borislav Petkov <bp@alien8.de>
+ *	          2013-2018 Borislav Petkov <bp@alien8.de>
  *
  *  Author: Peter Oruba <peter.oruba@amd.com>
  *