qcacld-3.0: Fix frame lenth information to cfg80211

Propagation from qcacld-2.0 to qcacld-3.0

During BSS frame update, frame_len is calculated as size of ieee80211_mgmt
and ielen. Since ieee80211_mgmt is a generic frame structure and different
frame structures are defined under union this may exceed the actual frame
len.

Fix by calculatiing offset of variable(ies) and ies length.

Change-Id: Ied8e4e604e41de1ac5ccc047ef5cc3cdb05a9445
CRs-Fixed: 2121711

core/hdd/src/wlan_hdd_cfg80211.c

@@ -14649,7 +14649,8 @@ struct cfg80211_bss *wlan_hdd_cfg80211_inform_bss_frame(struct hdd_adapter *adap
 	struct ieee80211_channel *chan;
 	struct ieee80211_mgmt *mgmt = NULL;
 	struct cfg80211_bss *bss_status = NULL;
-	size_t frame_len = sizeof(struct ieee80211_mgmt) + ie_length;
+	size_t frame_len = ie_length + offsetof(struct ieee80211_mgmt,
+						u.probe_resp.variable);
 	int rssi = 0;
 	struct hdd_context *hdd_ctx;
 	struct timespec ts;