drm/display/dp_mst: Handle old/new payload states in drm_dp_remove_payload()

Atm, drm_dp_remove_payload() uses the same payload state to both get the
vc_start_slot required for the payload removal DPCD message and to
deduct time_slots from vc_start_slot of all payloads after the one being
removed.

The above isn't always correct, as vc_start_slot must be the up-to-date
version contained in the new payload state, but time_slots must be the
one used when the payload was previously added, contained in the old
payload state. The new payload's time_slots can change vs. the old one
if the current atomic commit changes the corresponding mode.

This patch let's drivers pass the old and new payload states to
drm_dp_remove_payload(), but keeps these the same for now in all drivers
not to change the behavior. A follow-up i915 patch will pass in that
driver the correct old and new states to the function.

Cc: Lyude Paul <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Wayne Lin <[email protected]>
Cc: [email protected] # 6.1
Cc: [email protected]
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Acked-by: Lyude Paul <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Acked-by: Wayne Lin <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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