misc: Allow child devices

Allow misc devices to have children, so that we can use this uclass for
cases where a child device (e.g. I2S) needs to access a misc driver for
transferring data.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/misc/misc-uclass.c

@@ -68,4 +68,7 @@ int misc_set_enabled(struct udevice *dev, bool val)
 UCLASS_DRIVER(misc) = {
 	.id		= UCLASS_MISC,
 	.name		= "misc",
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+	.post_bind	= dm_scan_fdt_dev,
+#endif
 };