net: dsa: mv88e6xxx: convert to phylink_generic_validate()

Now that the mv88e6xxx chip drivers are supplying the supported
interfaces and MAC capabilities, switch the driver to use the generic
phylink validation implementation by removing our own validation
implementations. This causes DSA to call phylink_generic_validate()
on our behalf.
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.h

@@ -613,9 +613,6 @@ struct mv88e6xxx_ops {
 	/* Phylink */
 	void (*phylink_get_caps)(struct mv88e6xxx_chip *chip, int port,
 				 struct phylink_config *config);
-	void (*phylink_validate)(struct mv88e6xxx_chip *chip, int port,
-				 unsigned long *mask,
-				 struct phylink_link_state *state);
 
 	/* Max Frame Size */
 	int (*set_max_frame_size)(struct mv88e6xxx_chip *chip, int mtu);