ASoC: fsl_sai: 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/fsl/fsl_sai.c

@@ -801,6 +801,7 @@ static const struct of_device_id fsl_sai_ids[] = {
 	{ .compatible = "fsl,imx6sx-sai", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, fsl_sai_ids);
 
 static struct platform_driver fsl_sai_driver = {
 	.probe = fsl_sai_probe,