drm/atomic-helper: Unexport drm_atomic_helper_best_encoder

It's the default. The exported version was kinda a transition state,
before we made this the default.

To stop new atomic drivers from using it (instead of just relying on
the default) let's unexport it.

v2: rename the default implementation to a more fitting name and add a
comment (Laurent)

Signed-off-by: Daniel Vetter <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: VMware Graphics <[email protected]>
Cc: Sinclair Yeh <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: Archit Taneja <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Hans Verkuil <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Russell King <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Pierre-Hugues Husson <[email protected]>
Cc: Fabio Estevam <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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