net: dsa: qca8k: move qca8k_phylink_mac_link_state()

Move qca8k_phylink_mac_link_state() to separate the code movement from
code changes.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>