select vaapi drm renderer

[Vavooon]

It looks like gstreamer-vaapi selects first render node
https://github.com/GStreamer/gstreamer-vaapi/blob/5ee46f6751dc03b9981f1a8d9da76b31fa3c1a1f/gst-libs/gst/vaapi/gstvaapidisplay_drm.c#L76
So you may try to create udev rule which makes alias to the desired node
with lower number, e.g. /dev/dri/renderD127 or even /dev/dri/renderD1



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