gpu: host1x: Register child devices

In order to remove the dependency on the simple-bus compatible string,
which causes the OF driver core to register all child devices, make the
host1x driver explicitly register its children.

Signed-off-by: Thierry Reding <[e-mail]>

drivers/gpu/host1x/dev.c

···
 	if (err < 0)
 		goto deinit_debugfs;
 
+	err = devm_of_platform_populate(&pdev->dev);
+	if (err < 0)
+		goto unregister;
+
 	return 0;
 
+unregister:
+	host1x_unregister(host);
 deinit_debugfs:
 	host1x_debug_deinit(host);
 	host1x_intr_deinit(host);