modesetting: Support universal planes to retrieve plane modifier info

When modifier support is enabled but atomic modeset is disabled, we
don't get any information about supported modifiers and thus end up
using format+modifier combinations for back buffers that do not support
pageflipping.

See 7c63c582 for more details and
complete investigation.

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
5 jobs for use-universal-planes in 7 minutes and 32 seconds (queued for 4 seconds)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-buster #13374914

00:00:25

 
  Build And Test
passed autotools #13374915

00:07:06

passed meson #13374916

00:03:04

passed meson-noglamor #13374917

00:02:23

passed mingw-cross-build #13374918

00:00:56