net: dsa: mv88e6xxx: fix BMSR error to be consistent with others

Other errors accessing the registers in mv88e6352_serdes_pcs_get_state()
print "PHY " before the register name, except for the BMSR. Make this
consistent with the other error messages.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/mv88e6xxx/serdes.c

@@ -191,7 +191,7 @@ int mv88e6352_serdes_pcs_get_state(struct mv88e6xxx_chip *chip, int port,
 
 	err = mv88e6352_serdes_read(chip, MII_BMSR, &bmsr);
 	if (err) {
-		dev_err(chip->dev, "can't read Serdes BMSR: %d\n", err);
+		dev_err(chip->dev, "can't read Serdes PHY BMSR: %d\n", err);
 		return err;
 	}