drm/vc4: crtc: Make encoder lookup helper public

We'll need a function that looks up an encoder by its vc4_encoder_type.
Such a function is already present in the CRTC code, so let's make it
public so that we can reuse it in the unit tests.

Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Maíra Canal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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