net: phy: switch drivers to use dynamic feature detection

Recently genphy_read_abilities() has been added that dynamically detects
clause 22 PHY abilities. I *think* this detection should work with all
supported PHY's, at least for the ones with basic features sets, i.e.
PHY_BASIC_FEATURES and PHY_GBIT_FEATURES. So let's remove setting these
features explicitly and rely on phylib feature detection.

I don't have access to most of these PHY's, therefore I'd appreciate
regression testing.

v2:
- make the feature constant a comment so that readers know which
  features are supported by the respective PHY

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/dp83822.c

@@ -310,7 +310,7 @@ static int dp83822_resume(struct phy_device *phydev)
 	{							\
 		PHY_ID_MATCH_MODEL(_id),			\
 		.name		= (_name),			\
-		.features	= PHY_BASIC_FEATURES,		\
+		/* PHY_BASIC_FEATURES */			\
 		.soft_reset	= dp83822_phy_reset,		\
 		.config_init	= dp83822_config_init,		\
 		.get_wol = dp83822_get_wol,			\