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/drivers/tpm/tpm_atmel_twi.c b/drivers/tpm/tpm_atmel_twi.c
index 4fd772d..8608487 100644
--- a/drivers/tpm/tpm_atmel_twi.c
+++ b/drivers/tpm/tpm_atmel_twi.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2013 Guntermann & Drunck, GmbH
  *
- * Written by Dirk Eibach <eibach@gdsys.de>
+ * Written by Dirk Eibach <dirk.eibach@gdsys.cc>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */