qcacld-3.0: Reset hdd_reassoc_scenario flag on disconnection

After successful roam synch indication received in 802.1x/WPA3
security roaming, the peer will not be in authorized state since
EAP/EAPOL handshake is handled at the supplicant. Simultaneously
there is continuous vdev pause/unpause events from firmware, so
EAP handshake fails and EAP timeout kicks-in at supplicant and
disconnect is triggered. But on new connection the
hdd_reassoc_scenario flag is not reset, so
__wlan_hdd_cfg80211_ll_stats_get always returns failure and the
framework displays low rssi even though the connected AP rssi
is good.

Reset the hdd_reassoc_scenario flag after any disconnection.

Change-Id: I7b00fef86fa37d6e7ab857be1750add142f7e647
CRs-Fixed: 2752022