drm/i915/display: add step name in display runtime info
Initialize the stepping name in display runtime info. This avoids having
to use intel_step_name().
For display device info print at boot, debugfs and snapshot this changes
the unknown step name from ** to N/A, which is more user friendly
anyway.
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://patch.msgid.link/aab445dedb8235d9fdddfe2ee5bb624cdf453a18.1773663208.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>