Change my mailaddress

I'll switch my mails to my own server, so drop all gmail references.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/powerpc/lib/stack.c b/arch/powerpc/lib/stack.c
index 1985f03..7eccfe0 100644
--- a/arch/powerpc/lib/stack.c
+++ b/arch/powerpc/lib/stack.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 Andreas Bießmann <andreas.devel@googlemail.com>
+ * Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
  *
  * Copyright (c) 2011 The Chromium OS Authors.
  * (C) Copyright 2002-2006