drm/nouveau: Don't pm_runtime_put_sync(), only pm_runtime_put_autosuspend()

While trying to fix another issue, it occurred to me that I don't actually
think there is any situation where we want pm_runtime_put() in nouveau to
be synchronous. In fact, this kind of just seems like it would cause
issues where we may unexpectedly block a thread we don't expect to be
blocked.

So, let's only use pm_runtime_put_autosuspend().

Changes since v1:
* Use pm_runtime_put_autosuspend(), not pm_runtime_put()

Signed-off-by: Lyude Paul <[e-mail]>
Reviewed-by: David Airlie <[e-mail]>
Fixes: 3a6536c51d5d ("drm/nouveau: Intercept ACPI_VIDEO_NOTIFY_PROBE")
Cc: Hans de Goede <[e-mail]>
Cc: <[e-mail]> # v4.10+
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/nouveau/nouveau_display.c

···
 
 	pm_runtime_mark_last_busy(drm->dev->dev);
 noop:
-	pm_runtime_put_sync(drm->dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
 }
 
 #ifdef CONFIG_ACPI

drivers/gpu/drm/nouveau/nouveau_fbcon.c

···
 	if (state == FBINFO_STATE_RUNNING) {
 		nouveau_fbcon_hotplug_resume(drm->fbcon);
 		pm_runtime_mark_last_busy(drm->dev->dev);
-		pm_runtime_put_sync(drm->dev->dev);
+		pm_runtime_put_autosuspend(drm->dev->dev);
 	}
 }