rtc: max77686: Report platform modalias to fix module autoload

If the rtc-max77686 driver is built as a module, modalias information is
not filled so the module is not autoloaded. Use the MODULE_DEVICE_TABLE()
macro to export the platform ID table so the module contains that data.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 7632a87..7184a0e 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -511,6 +511,7 @@
 	{ "max77686-rtc", 0 },
 	{},
 };
+MODULE_DEVICE_TABLE(platform, rtc_id);
 
 static struct platform_driver max77686_rtc_driver = {
 	.driver		= {