media: MAINTAINERS: add microchip csi2dc

Add Microchip CSI2DC driver in the list.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>