drm/i915: Fix CONFIG_DRM_I915_DEBUG_RUNTIME_PM=n build

drm/i915: Fix CONFIG_DRM_I915_DEBUG_RUNTIME_PM=n build

Looks like I missed one of myriad CONFIG_DRM_I915_DEBUG_RUNTIME_PM=n
special cases when converting the intel_display_power_{get,put}()
code to use struct intel_display. Only noticed after the fact
when building a EXPERT=n kernel :/

Fixes: 5dcfda5cfa42 ("drm/i915: Convert intel_display_power_{get,put}*() to intel_display")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250211000135.6096-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>