net: dsa: mv88e6xxx: use mv88e6xxx_phy_is_internal in mv88e6xxx_port_ppu_updates

Make sure to use existing helper to get internal PHYs count instead of
redoing it manually
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -477,7 +477,7 @@ static int mv88e6xxx_port_ppu_updates(struct mv88e6xxx_chip *chip, int port)
 	 * report whether the port is internal.
 	 */
 	if (chip->info->family == MV88E6XXX_FAMILY_6250)
-		return port < chip->info->num_internal_phys;
+		return mv88e6xxx_phy_is_internal(chip, port);
 
 	err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &reg);
 	if (err) {