libs: display: egl: initialize params structure
libs: display: egl: initialize params structure

Statically initialise the internal params structure.

https://bugzilla.gnome.org/show_bug.cgi?id=795391

GStreamer/gstreamer-vaapi,ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,ceyusa/gstreamer-vaapi