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 <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Acked-by: Russell King (Oracle) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

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

···
 EXPORT_SYMBOL_GPL(bcm_ptp_probe);
 
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Broadcom PHY PTP driver");

drivers/net/phy/bcm87xx.c

···
 module_phy_driver(bcm87xx_driver);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Broadcom BCM87xx PHY driver");

drivers/net/phy/phylink.c

···
 module_init(phylink_init);
 
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("phylink models the MAC to optional PHY connection");

drivers/net/phy/sfp.c

···
 MODULE_ALIAS("platform:sfp");
 MODULE_AUTHOR("Russell King");
 MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SFP cage support");