MAINTAINERS: add Stefan Mätje as maintainer for the esd electronics GmbH PCIe/402 CAN drivers

Adding myself (Stefan Mätje) as a maintainer for the upcoming driver of
the PCIe/402 interface card family.
Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Link: https://lore.kernel.org/all/20231122160211.2110448-2-stefan.maetje@esd.euSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

MAINTAINERS

@@ -7887,6 +7887,13 @@ S:	Maintained
 F:	include/linux/errseq.h
 F:	lib/errseq.c
 
+ESD CAN NETWORK DRIVERS
+M:	Stefan Mätje <stefan.maetje@esd.eu>
+R:	socketcan@esd.eu
+L:	linux-can@vger.kernel.org
+S:	Maintained
+F:	drivers/net/can/esd/
+
 ESD CAN/USB DRIVERS
 M:	Frank Jungclaus <frank.jungclaus@esd.eu>
 R:	socketcan@esd.eu