qcacmn: Add ini to enable/disable self roaming

Currently the driver allows roaming to the BSSID
which it is already connected, which can lead to
many unexpected behaviour, for eg. if the SAP
to which the DUT is connected turns off, then the
DUT would try to roam to other BSSID of the same
SSID, and in case the SAP turns on back in time,
then the DUT would re-associate to the same BSSID.
Now if the subnet may change, and since the DHCP
does not happen again in roaming, it would then
lead to NUD failure.

Fix is to introduce an ini to allow/disallow
roaming to the same BSSID.

Change-Id: I38887bbfb74c4856a06956591be4159734f7fbf0
CRs-Fixed: 2650346

wmi/inc/wmi_unified_param.h

@@ -1650,6 +1650,7 @@ struct roam_fils_params {
  * @mode: stores flags for scan
  * @vdev_id: vdev id
  * @roam_offload_enabled: flag for offload enable
+ * @disable_self_roam: disable roaming to self BSSID
  * @psk_pmk: pre shared key/pairwise master key
  * @pmk_len: length of PMK
  * @prefer_5ghz: prefer select 5G candidate
@@ -1692,6 +1693,7 @@ struct roam_offload_scan_params {
 	uint32_t vdev_id;
 #ifdef WLAN_FEATURE_ROAM_OFFLOAD
 	uint8_t roam_offload_enabled;
+	bool disable_self_roam;
 	uint8_t psk_pmk[WMI_ROAM_SCAN_PSK_SIZE];
 	uint32_t pmk_len;
 	uint8_t prefer_5ghz;

wmi/src/wmi_unified_roam_tlv.c

@@ -1221,7 +1221,8 @@ send_roam_scan_offload_mode_cmd_tlv(wmi_unified_t wmi_handle,
 			roam_req->reassoc_failure_timeout;
 		roam_offload_params->roam_candidate_validity_time =
 			roam_req->rct_validity_timer;
-
+		roam_offload_params->roam_to_current_bss_disable =
+					roam_req->disable_self_roam;
 		/* Fill the capabilities */
 		roam_offload_params->capability =
 				req_offload_params->capability;