drm/i915/backlight: convert DRM_DEBUG_KMS() to drm_dbg_kms()

Fix the final straggler.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4769f8377be11536bd19840a2e59ef9f8c0a558c.1670405587.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_backlight.c

@@ -866,8 +866,8 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
 
 	drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
 
-	DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
-		      bd->props.brightness, bd->props.max_brightness);
+	drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",
+		    bd->props.brightness, bd->props.max_brightness);
 	intel_panel_set_backlight(connector->base.state, bd->props.brightness,
 				  bd->props.max_brightness);