MAINTAINERS: add maintainer for the GOcontroll Moduline module slot

Add a maintainer for the GOcontroll Moduline module slot bindings and
future driver.

Signed-off-by: Maud Spierings <maudspierings@gocontroll.com>
Link: https://patch.msgid.link/20250226-initial_display-v2-6-23fafa130817@gocontroll.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: SpieringsAE

MAINTAINERS

@@ -9820,6 +9820,11 @@ L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	drivers/media/usb/go7007/
 
+GOCONTROLL MODULINE MODULE SLOT
+M:	Maud Spierings <maudspierings@gocontroll.com>
+S:	Maintained
+F:	Documentation/connector/gocontroll,moduline-module-slot.yaml
+
 GOODIX TOUCHSCREEN
 M:	Bastien Nocera <hadess@hadess.net>
 M:	Hans de Goede <hdegoede@redhat.com>