treewide: Fix gdsys mail addresses

The @gdsys.cc addresses are supposed to be used for mailing lists.
Switch all occurrences of @gdsys.de mail addresses to their @gdsys.cc
equivalent.

Also, Dirk's address was wrong in one place; fix that as well.

Signed-off-by: Mario Six <six@gdsys.cc>
diff --git a/include/configs/strider.h b/include/configs/strider.h
index 14b03c8..9ba52d1 100644
--- a/include/configs/strider.h
+++ b/include/configs/strider.h
@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2014
- * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  *
  *
  * SPDX-License-Identifier:	GPL-2.0+