mfvideosrc: Fix negotiation when interlace-mode is specified

Given caps does not need to be strictly subset of device caps.
Allow accept it if device caps and requested caps can intersect

Fixes: gstreamer/gst-plugins-bad#1619
Part-of: <gstreamer/gst-plugins-bad!2391>
29 jobs for !2391 with backport-mr-2384-into-1.18-mfvideosrc-nego-fix in 25 minutes and 26 seconds (queued for 11 seconds)
merge request