qcacld-3.0: Update roam delta to neighbor roam info only

Currently, roam delta is updated to global mac ctx when it's
updated through DRIVER command. But the update should
happen only to the neighbor roam info of the corresponding vdev.
Retrieval also should happen based on vdev.

Change-Id: I355b9db2e142d4205088627672c3fb27c32d7fbd
CRs-Fixed: 2530333

mlme/dispatcher/inc/wlan_mlme_public_struct.h

@@ -1522,7 +1522,7 @@ struct wlan_mlme_lfr_cfg {
 	uint32_t max_num_pre_auth;
 	uint32_t roam_preauth_retry_count;
 	uint32_t roam_preauth_no_ack_timeout;
-	uint32_t roam_rssi_diff;
+	uint8_t roam_rssi_diff;
 	bool roam_scan_offload_enabled;
 	uint32_t neighbor_scan_timer_period;
 	uint32_t neighbor_scan_min_timer_period;