drm/connector: Share with non-atomic drivers the function to get the single encoder

This 3 non-atomic drivers all have the same function getting the
only encoder available in the connector, also atomic drivers have
this fallback. So moving it a common place and sharing between atomic
and non-atomic drivers.

While at it I also removed the mention of
drm_atomic_helper_best_encoder() that was renamed in
commit 297e30b5d9b6 ("drm/atomic-helper: Unexport
drm_atomic_helper_best_encoder").

v3: moving drm_connector_get_single_encoder to drm_kms_helper module

Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Suggested-by: Ville Syrjälä <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: José Roberto de Souza <[email protected]>
Signed-off-by: Manasi Navare <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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