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>

drivers/rtc/rtc-max77686.c

@@ -511,6 +511,7 @@ static const struct platform_device_id rtc_id[] = {
 	{ "max77686-rtc", 0 },
 	{},
 };
+MODULE_DEVICE_TABLE(platform, rtc_id);
 
 static struct platform_driver max77686_rtc_driver = {
 	.driver		= {