net: phy: fill in missing MODULE_DESCRIPTION()s

W=1 builds now warn if a module is built without a
MODULE_DESCRIPTION(). Fill them in based on the Kconfig text, or
similar.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20231028184458.99448-2-andrew@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/bcm-phy-ptp.c

@@ -942,3 +942,4 @@ struct bcm_ptp_private *bcm_ptp_probe(struct phy_device *phydev)
 EXPORT_SYMBOL_GPL(bcm_ptp_probe);
 
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Broadcom PHY PTP driver");

drivers/net/phy/bcm87xx.c

@@ -223,3 +223,4 @@ static struct phy_driver bcm87xx_driver[] = {
 module_phy_driver(bcm87xx_driver);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Broadcom BCM87xx PHY driver");

drivers/net/phy/phylink.c

@@ -3726,3 +3726,4 @@ static int __init phylink_init(void)
 module_init(phylink_init);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("phylink models the MAC to optional PHY connection");

drivers/net/phy/sfp.c

@@ -3153,3 +3153,4 @@ module_exit(sfp_exit);
 MODULE_ALIAS("platform:sfp");
 MODULE_AUTHOR("Russell King");
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SFP cage support");