drm/i915: Call runtime_pm_disable directly

Allows us to mark it static and so forgoe the kerneldoc for it.

Note that intel_power_domains_fini is also called from failure paths
in the driver load sequence. But the call to runtime_pm_disable for
that is harmless since by default runtime pm is already disabled.

v2: Augment the commit message as discussed with Imre on irc.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_dma.c

@@ -1846,12 +1846,10 @@ int i915_driver_unload(struct drm_device *dev)
 		return ret;
 	}
 
-	intel_runtime_pm_disable(dev_priv);
+	intel_power_domains_fini(dev_priv);
 
 	intel_gpu_ips_teardown();
 
-	intel_power_domains_fini(dev_priv);
-
 	i915_teardown_sysfs(dev);
 
 	WARN_ON(unregister_oom_notifier(&dev_priv->mm.oom_notifier));