drm/i915/hti: abstract hti handling
The HTI or HDPORT handling is sprinkled around. Centralize to one place. Add a note about how subtle the mapping from HDPORT_STATE register to dpll mask actually is. Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221109144209.3624739-1-jani.nikula@intel.com
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