drm/i915: s/dev_priv/i915/ in the state checker

Switch the state checker over to using the new 'i915' variable
name insteda of the old 'dev_priv'.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231004155607.7719-13-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>