net: pcs: add C37 SGMII AN support for intel mGbE controller

commit 551eecde078d0e28415945c35af81f5f13c399c1 from
https://source.codeaurora.org/external/autobsps32/linux



XPCS IP supports C37 SGMII AN process and it is used in intel multi-GbE
controller as MAC-side SGMII.

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 b97b5331)
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>