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/board/gdsys/mpc8308/MAINTAINERS b/board/gdsys/mpc8308/MAINTAINERS
index 21470bf..755b9a2 100644
--- a/board/gdsys/mpc8308/MAINTAINERS
+++ b/board/gdsys/mpc8308/MAINTAINERS
@@ -1,5 +1,5 @@
 MPC8308 BOARD
-M:	Dirk Eibach <eibach@gdsys.de>
+M:	Dirk Eibach <dirk.eibach@gdsys.cc>
 S:	Maintained
 F:	board/gdsys/mpc8308/
 F:	include/configs/hrcon.h