net: phylink: fix interface passed to mac_link_up

A mismerge between the following two commits:

c6787263 ("net: phylink: ensure consistent phy interface mode")
27755ff8 ("net: phylink: Add phylink_mac_link_{up, down} wrapper functions")

resulted in the wrong interface being passed to the mac_link_up()
function. Fix this up.

Fixes: b4b12b0d ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net"

)
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>