drm/i915: Extract intel_wm_plane_visible()

All platforms that lack double buffered watermarks will need to
handle the legacy cursor updates in the same way. So let's extract the
logic to determine the plane visibility into a small helper. For
simplicity we'll make the function DTRT for any plane, but only apply
the special sauce for cursor planes.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Tested-by: Dorota Czaplejewicz <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>

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