Early init drm_dp_aux for internal use before i2c-core is ready

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In order to break a chicken-and-egg problem in wanting to use
i2c_transfer on the drm_dp_aux before it is registered with userspace
(which is a requirement for i2c_add_adapter() sadly), we need to prepare
enough state internally so that drm_dp_aux->algo->master_xfer() is
operation. A trio of patches to expose this operation from i2c has been
sent, which we can plug in here to replace the open-coding. I want to
get the ball rolling on this as I have a regression fix pending getting
i915 init reordered.
-Chris

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