drm/i915: tune down DIDL warning about too many outputs

Nothing the user (nor we) really can do about this, but upsets a nice
quiet boot.

Note that this happens mostly on SDVs where OEMs obviously haven't had
a chance yet to appropriately trim the output list.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65988
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: Amend commit message a bit to clarify a question from Paulo.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_opregion.c

@@ -311,8 +311,8 @@ static void intel_didl_outputs(struct drm_device *dev)
 
 	list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {
 		if (i >= 8) {
-			dev_printk(KERN_ERR, &dev->pdev->dev,
-				   "More than 8 outputs detected via ACPI\n");
+			dev_dbg(&dev->pdev->dev,
+				"More than 8 outputs detected via ACPI\n");
 			return;
 		}
 		status =
@@ -338,8 +338,8 @@ blind_set:
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		int output_type = ACPI_OTHER_OUTPUT;
 		if (i >= 8) {
-			dev_printk(KERN_ERR, &dev->pdev->dev,
-				   "More than 8 outputs in connector list\n");
+			dev_dbg(&dev->pdev->dev,
+				"More than 8 outputs in connector list\n");
 			return;
 		}
 		switch (connector->connector_type) {