This allows an application to provide their own opened DRM device fd handle to kmssink. For example, an application can lease multiple fd's from a DRM master to display on different CRTC outputs at the same time with multiple kmssink instances. Specifying the fd property is not allowed when driver-name and/or bus-id properties are specified. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2807>