qcacld-3.0: Drop assoc req if sap is not in WLAN_VDEV_SS_UP_ACTIVE
Assoc req can only be handled when the sap is in WLAN_VDEV_S_UP state
and WLAN_VDEV_SS_UP_ACTIVE substate.
Assoc req can't be handled in WLAN_VDEV_SS_MLO_SYNC_WAIT substate.
Change-Id: If7a7db06df04dfe54e1a7b9abefaba2372d40516
CRs-Fixed: 2866182