media: MAINTAINERS: Add GalaxyCore in camera sensor section

"gc" prefixed i2c media drivers are most likely GalaxyCore camera
sensor drivers, so add it to the list.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

MAINTAINERS

@@ -22851,6 +22851,7 @@ S:	Maintained
 F:	Documentation/driver-api/media/camera-sensor.rst
 F:	Documentation/driver-api/media/tx-rx.rst
 F:	drivers/media/i2c/ar*
+F:	drivers/media/i2c/gc*
 F:	drivers/media/i2c/hi*
 F:	drivers/media/i2c/imx*
 F:	drivers/media/i2c/mt*