drm/atomic-helper: Check encoder/crtc constraints

This was totally lost when I originally created the atomic helpers.

We probably should also check possible_clones in the helpers, but
since the legacy ones didn't do that this is for a separate patch.

Reported-by: Ville Syrjälä <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Daniel Stone <[email protected]>
Reviewed-by: Daniel Stone <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Tested-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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