qcacld-3.0: Clear user disabled_roaming flag for new connection

User/wpa_supplicant disable roaming flag is only effective for current
 connection, it will be cleared during new connection.
 APP/wpa_supplicant can uses QCA_NL80211_VENDOR_SUBCMD_ROAMING to change
 roaming behavior for current connection.

Change-Id: If9f439f51e25e3d67f5db5557c0d8f468b071596
CRs-Fixed: 3737996

components/mlme/dispatcher/inc/wlan_mlme_public_struct.h

@@ -1818,7 +1818,7 @@ enum station_prefer_bw {
  * @single_tid:                     Set replay counter for all TID
  * @allow_tpc_from_ap:              Support for AP power constraint
  * @sta_keepalive_method:           STA keepalive method
- * @usr_disabled_roaming:           User config for roaming disable
+ * @usr_disabled_roaming:           User disable roaming for current connection
  * @usr_scan_probe_unicast_ra:      User config unicast probe req in scan
  * @event_payload:                  Diagnostic event payload
  * @max_li_modulated_dtim_time_ms:  Max modulated DTIM time in ms.