renesas: beacon-rzg2m: Add Marek to MAINTAINER file

Since any changes to the RZ/G2 family go through Marek's tree,
update the MAINTAINER file to automatically show his name
when running get_maintainer.pl.  Without this, he is not
copied.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
1 file changed