3-link ML connection/roaming expects link id to generate link
specific (re)assoc response from received (re)assoc response.
This info is fetched from pe_session but it's not populated
properly in case of roaming. Roam sync indication carries all
links info whereas the assoc rsp generation API expects the
link info for which it has to be generated.
Copy partner link info only from roam sync indication to
pe_session to cater the same.
Change-Id: I75c9a42688f7613ca3f1afab8afe77622bb659aa
CRs-Fixed: 3412939