rtc: efi: Remove the repeated module alias

'MODULE_ALIAS' is declared twice, cleanup one.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1621848834-20857-1-git-send-email-zhangshaokun@hisilicon.com

drivers/rtc/rtc-efi.c

@@ -280,7 +280,6 @@ static struct platform_driver efi_rtc_driver = {
 
 module_platform_driver_probe(efi_rtc_driver, efi_rtc_probe);
 
-MODULE_ALIAS("platform:rtc-efi");
 MODULE_AUTHOR("dann frazier <dannf@dannf.org>");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("EFI RTC driver");