Input: pwm-beeper - 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: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c
index e82edf8..f2261ab 100644
--- a/drivers/input/misc/pwm-beeper.c
+++ b/drivers/input/misc/pwm-beeper.c
@@ -173,6 +173,7 @@
 	{ .compatible = "pwm-beeper", },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, pwm_beeper_match);
 #endif
 
 static struct platform_driver pwm_beeper_driver = {