phy: cadence: Sierra: drop unused module alias

The driver has never supported anything but OF probe so drop the unused
platform module alias.

Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/cadence/phy-cadence-sierra.c

···
 };
 module_platform_driver(cdns_sierra_driver);
 
-MODULE_ALIAS("platform:cdns_sierra");
 MODULE_AUTHOR("Cadence Design Systems");
 MODULE_DESCRIPTION("CDNS sierra phy driver");
 MODULE_LICENSE("GPL v2");