phylink: ensure we report link down when LOS asserted

Although we disable the netdev carrier, we fail to report in the kernel
log that the link went down.  Fix this.

Fixes: 9525ae83 ("phylink: add phylink infrastructure")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>