qcacld-3.0: Clear reassoc_scenario flag when ASSOCIATION_COMPLETION
Currently, sta_ctx->hdd_reassoc_scenario is set when ROAM_FT_START
and cleared when ROAM_SET_KEY_COMPLETE. But for some roaming case,
no KEY exchange happen after roaming complete. Then this flag
is not cleared, which cause failure to get station stats in
wlan_hdd_get_sta_stats, such as RSSI info. To address this, clear
sta_ctx->hdd_reassoc_scenario when handling
ROAM_ASSOCIATION_COMPLETION.
Change-Id: I0b96246afe227023fd52df93f27bed23ffd7cb1c
CRs-Fixed: 2763178