net: phy: restart phy autonegotiation after EEE advertisment change

When the EEE advertisment is changed, we should restart autonegotiation
to update the link partner with the new EEE settings.  Add this trigger
but only if the advertisment has changed.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>