ASoC: atmel_wm8904: Fix module autoload for OF platform driver

This platform driver has a OF device ID table but the OF module
alias information is not created so module autoloading won't work.

Signed-off-by: Luis de Bethencourt <luis@debethencourt.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/atmel/atmel_wm8904.c

@@ -176,6 +176,7 @@ static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
 	{ .compatible = "atmel,asoc-wm8904", },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
 #endif
 
 static struct platform_driver atmel_asoc_wm8904_driver = {