rtc: Drop owner assignment from platform_driver

platform_driver does not need to set an owner because
platform_driver_register() will set it.

Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-opal.c

···
 	.id_table	= opal_rtc_driver_ids,
 	.driver		= {
 		.name		= DRVNAME,
-		.owner		= THIS_MODULE,
 		.of_match_table	= opal_rtc_match,
 	},
 };