drm/i915/dp: Prevent link training fallback on disconnected port

Prevent downgrading the link training maximum lane count/rate if the
sink is disconnected - and so the link training failure is expected. In
such cases modeset failures due to the reduced max link params would be
just confusing for user space (instead of which the correct thing it
should act on is the sink disconnect signaled by a hotplug event,
requiring a disabling modeset).

v2:
- Check the actual HPD state to handle the forced connector state case.
  (Vinod)

Cc: Ville Syrjälä <[email protected]>
Cc: Vinod Govindapillai <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]> (v1)
Reviewed-by: Vinod Govindapillai <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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