drm/i915/display: convert intel_ddi_buf_trans.c to struct intel_display

drm/i915/display: convert intel_ddi_buf_trans.c to struct intel_display

Going forward, struct intel_display is the main device data structure
for display. Switch to it.

For MISSING_CASE(), log the PCI ID instead of the platform to get rid of
the i915_drv.h dependency.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250204134228.2934744-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>