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/verdin-imx8mm/MAINTAINERS b/board/toradex/verdin-imx8mm/MAINTAINERS
index 08c3701..7965975 100644
--- a/board/toradex/verdin-imx8mm/MAINTAINERS
+++ b/board/toradex/verdin-imx8mm/MAINTAINERS
@@ -1,5 +1,5 @@
 Verdin iMX8M Mini
-M:	Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
+M:	Marcel Ziswiler <marcel.ziswiler@toradex.com>
 W:	https://www.toradex.com/computer-on-modules/verdin-arm-family/nxp-imx-8m-mini
 S:	Maintained
 F:	arch/arm/dts/imx8mm-verdin.dts