In struct roam_offload_scan_rssi_params the legacy identifier
session_id is currently used to identify the vdev of interest. To
align with the converged nomenclature rename this to vdev_id.
This is co-dependent with Ifb2282b8977ad1fb999e8460c0d276343793a0c6
("qcacld-3.0: Use vdev_id in roam_offload_scan_rssi_params").
Change-Id: Ifbbca30b9aca9688931ac0f4e4f703c28ad0ad32
CRs-Fixed: 2404094