toradex: take over maintainership

Also take over maintainership of remaining Toradex SoMs as Oleksandr
has left our company.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
CC: Oleksandr Suvorov <cryosay@gmail.com>
diff --git a/board/toradex/colibri_t30/MAINTAINERS b/board/toradex/colibri_t30/MAINTAINERS
index ded9e28..c2d6587 100644
--- a/board/toradex/colibri_t30/MAINTAINERS
+++ b/board/toradex/colibri_t30/MAINTAINERS
@@ -1,5 +1,5 @@
 Colibri T30
-M:	Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
+M:	Marcel Ziswiler <marcel.ziswiler@toradex.com>
 S:	Maintained
 F:	board/toradex/colibri_t30/
 F:	include/configs/colibri_t30.h