net: mdio: Remove support for building C45 muxed addresses

The old way of performing a C45 bus transfer created a special
register value and passed it to the MDIO bus driver, in the hope it
would see the MII_ADDR_C45 bit set, and perform a C45 transfer. Now
that there is a clear separation of C22 and C45, this scheme is no
longer used. Remove all the #defines and helpers, to prevent any code
being added which tries to use it.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/mdio.h

@@ -10,14 +10,6 @@
 #include <linux/bitfield.h>
 #include <linux/mod_devicetable.h>
 
-/* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
- * IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips.
- */
-#define MII_ADDR_C45		(1<<30)
-#define MII_DEVADDR_C45_SHIFT	16
-#define MII_DEVADDR_C45_MASK	GENMASK(20, 16)
-#define MII_REGADDR_C45_MASK	GENMASK(15, 0)
-
 struct gpio_desc;
 struct mii_bus;
 struct reset_control;
@@ -463,16 +455,6 @@ static inline int mdiodev_modify_changed(struct mdio_device *mdiodev,
 				      mask, set);
 }
 
-static inline u16 mdiobus_c45_regad(u32 regnum)
-{
-	return FIELD_GET(MII_REGADDR_C45_MASK, regnum);
-}
-
-static inline u16 mdiobus_c45_devad(u32 regnum)
-{
-	return FIELD_GET(MII_DEVADDR_C45_MASK, regnum);
-}
-
 static inline int mdiodev_c45_modify(struct mdio_device *mdiodev, int devad,
 				     u32 regnum, u16 mask, u16 set)
 {