drm/panfrost: Reduce the amount of logs on deferred probe

There is no point to print deferred probe (and its failures to get
resources) as an error.  Also there is no need to print regulator errors
twice.

In case of multiple probe tries this would pollute the dmesg.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200527200544.7849-1-krzk@kernel.org

drivers/gpu/drm/panfrost/panfrost_device.c

@@ -101,7 +101,9 @@ static int panfrost_regulator_init(struct panfrost_device *pfdev)
 				      pfdev->comp->num_supplies,
 				      pfdev->regulators);
 	if (ret < 0) {
-		dev_err(pfdev->dev, "failed to get regulators: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(pfdev->dev, "failed to get regulators: %d\n",
+				ret);
 		return ret;
 	}
 
@@ -213,10 +215,8 @@ int panfrost_device_init(struct panfrost_device *pfdev)
 	}
 
 	err = panfrost_regulator_init(pfdev);
-	if (err) {
-		dev_err(pfdev->dev, "regulator init failed %d\n", err);
+	if (err)
 		goto err_out0;
-	}
 
 	err = panfrost_reset_init(pfdev);
 	if (err) {