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>
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index a18fd92..9366b5a 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -801,6 +801,7 @@
 	{ .compatible = "fsl,imx6sx-sai", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, fsl_sai_ids);
 
 static struct platform_driver fsl_sai_driver = {
 	.probe = fsl_sai_probe,