ced221dc2c61 drm/intel: add shared step.h and switch i915 to use it
938bad110594 drm/xe/compat: remove intel_step_name macro
65a6057f1f11 drm/i915/dmc: use step name from runtime info
a1ef1615703f drm/i915/display: add step name in display runtime info
3b00b9422927 drm/i915/dmc: simplify stepping info initialization