drm/amdgpu: Remove default best_encoder hook from DC

For atomic driver this is the default, no need to reimplement it. We
still need to keep the copypasta for not-atomic drivers though, since
no one polished the legacy crtc helpers as much as the atomic ones.

v2: amdgpu uses ->best_encoder internally, give it a local copy. It
might be a good idea to merge the connector and encoder into one
amdgpu_dm_sink structure, that might match DC internals better. At
least for non-DPMST outputs. Kudos to Ville for spotting this.

v3: Rebase onto a487411a6481 ("drm/amd/display: Use DRM helper for
best_encoder").

Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Andrey Grodzovsky <[email protected]>
Cc: Tony Cheng <[email protected]>
Cc: "Leo (Sunpeng) Li" <[email protected]>
Cc: Shirish S <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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