ASoC: bcm2835-i2s: Fix module autoload for OF platform drivers

These platform drivers have 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/bcm/bcm2835-i2s.c

@@ -862,6 +862,8 @@ static const struct of_device_id bcm2835_i2s_of_match[] = {
 	{},
 };
 
+MODULE_DEVICE_TABLE(of, bcm2835_i2s_of_match);
+
 static struct platform_driver bcm2835_i2s_driver = {
 	.probe		= bcm2835_i2s_probe,
 	.driver		= {