drm/amd/display: Generalize new minimal transition path

Previously the new minimal transition path was only used for windowed
MPO + ODM for plane scaling updates. However, we want to generalize the
transition for all cases whenever a non-seamless transition is detected
(such as for MPO -> SubVP + MPC).

To make this change we add pointers in the plane state, stream, and
pointers in the stream state to the dc_scratch state and backup and
restore these so the minimal transition can take place successfully.

Reviewed-by: Wenjing Liu <[email protected]>
Acked-by: Rodrigo Siqueira <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alvin Lee <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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