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>
diff --git a/sound/soc/atmel/atmel_wm8904.c b/sound/soc/atmel/atmel_wm8904.c
index aa354e1..1933bcd 100644
--- a/sound/soc/atmel/atmel_wm8904.c
+++ b/sound/soc/atmel/atmel_wm8904.c
@@ -176,6 +176,7 @@
 	{ .compatible = "atmel,asoc-wm8904", },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
 #endif
 
 static struct platform_driver atmel_asoc_wm8904_driver = {