Pull up following revision(s) (requested by andvar in ticket #661):

sys/dev/pci/if_mcx.c: revision 1.27

mcx(4): enforce full-duplex mark in mcx_media_status(), when link is up.

LACP protocol requires full-duplex to be enabled for lagg(4) to work,
however mcx(4) was not setting this capability making it to fail.

Fixes PR kern/58124.  OK'd by msaitoh@

(martin)