modesetting: Update props for dynamically added outputs

Dynamically added outputs should have their properties
properly updated as well. Otherwise we're left with an output
with many of its propeties not exposed.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Michel Dänzer <michel@daenzer.net>
3 jobs for dynamic_output_props in 6 minutes and 8 seconds (queued for 1 second)
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