net: stmmac: ensure phydev is attached to phylink for C37 AN

commit b1fd69b692a47c8c91ef414051c4caca444e9dde from
https://source.codeaurora.org/external/autobsps32/linux



As the support for MAC-side SGMII C37 AN is added to pcs-xpcs, phydev
should be attached to phylink during driver's open(). So, we change the
condition to "Not C73 AN" instead.

Issue: ALB-8243
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit c62808e8)
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>