vidmode: Let the driver resize the framebuffer when switching modes

Resize the framebuffer when switching modes with VidMode. This allows
better interaction with randr, which may have shrunk the framebuffer
when changing to a smaller mode.
2 jobs for vidmode-resize-fb in 2 minutes and 5 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-testing #89668

00:00:31

 
  Build And Test
passed build-and-test #89669

00:01:33