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/a38x/MAINTAINERS b/board/gdsys/a38x/MAINTAINERS
index 3cb9b63..d31e675 100644
--- a/board/gdsys/a38x/MAINTAINERS
+++ b/board/gdsys/a38x/MAINTAINERS
@@ -1,6 +1,6 @@
 A38X BOARD
-M:	Dirk Eibach <eibach@gdsys.cc>
-M:	Mario Six <six@gdsys.de>
+M:	Dirk Eibach <dirk.eibach@gdsys.cc>
+M:	Mario Six <mario.six@gdsys.cc>
 S:	Maintained
 F:	board/gdsys/a38x/
 F:	include/configs/controlcenterdc.h