board: gdsys: Drop Dirk Eibach from MAINTAINERS

I got an

<dirk.eibach@gdsys.cc>: host mxlb.ispgateway.de[80.67.18.126] said:
  554 Sorry, no mailbox here by that name. (in reply to RCPT TO command)

when sending e-mail to dirk.eibach@gdsys.cc.

Drop Dirk Eibach from MAINTAINERS of board/gdsys/a38x and
board/gdsys/mpc8308. The latter would be left maintainerless, add
Mario Six <mario.six@gdsys.cc> (he is also maintainer of the former
board).

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/gdsys/a38x/MAINTAINERS b/board/gdsys/a38x/MAINTAINERS
index d31e675..6492e79 100644
--- a/board/gdsys/a38x/MAINTAINERS
+++ b/board/gdsys/a38x/MAINTAINERS
@@ -1,5 +1,4 @@
 A38X BOARD
-M:	Dirk Eibach <dirk.eibach@gdsys.cc>
 M:	Mario Six <mario.six@gdsys.cc>
 S:	Maintained
 F:	board/gdsys/a38x/
diff --git a/board/gdsys/mpc8308/MAINTAINERS b/board/gdsys/mpc8308/MAINTAINERS
index dc0b389..57faba4 100644
--- a/board/gdsys/mpc8308/MAINTAINERS
+++ b/board/gdsys/mpc8308/MAINTAINERS
@@ -1,5 +1,5 @@
 MPC8308 BOARD
-M:	Dirk Eibach <dirk.eibach@gdsys.cc>
+M:	Mario Six <mario.six@gdsys.cc>
 S:	Maintained
 F:	board/gdsys/mpc8308/
 F:	include/configs/gazerbeam.h