Drm pick crtcs
Add support to the drm renderer plugin to pick crtcs for connected connectors which do not have a crtc assigned to them before plymouth starts. This fixes the drm plugin not working on nouveau / amd based devices when using a kernel with deferred fbcon takeover. This also fixes sometimes external monitors not being lit-up on i915 based laptops, see: https://bugzilla.redhat.com/show_bug.cgi?id=1652279