net: phy: fixed warning: Function parameter not described

Fixed warning: Function parameter or member 'enable' not
described in 'genphy_c45_fast_retrain'
Signed-off-by: Luo Jie <luoj@codeaurora.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20211026102957.17100-1-luoj@codeaurora.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/phy-c45.c

@@ -614,6 +614,7 @@ EXPORT_SYMBOL_GPL(genphy_c45_loopback);
 /**
  * genphy_c45_fast_retrain - configure fast retrain registers
  * @phydev: target phy_device struct
+ * @enable: enable fast retrain or not
  *
  * Description: If fast-retrain is enabled, we configure PHY as
  *   advertising fast retrain capable and THP Bypass Request, then