drm/i915: move PCH DP AUX CH regs to intel_dp_aux_regs.h
Move the macros where they belong.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/9bc3a7bb34edc5dc17ffcb2a9e64edcef8c7a7b8.1716894910.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>