gst: Add support for DMA_DRM / explicit modifiers
Gstreamer 1.24 added and largely switched to a new, modifier aware DMABuf API. Unfortunately that breaks the existing DMABuf support in the PW Gst element.
Add support for the new API.
This was mainly tested with Gnome-Shell screen casting in order to allow HW encoding with vapostproc
etc.
See also:
Edited by Robert Mader