qcacld-3.0: Remove typedef tSirNanEvent

Change I5565ef2eb72b3746e05cb8e16662985392bcc802 ("qcacld-3.0: Remove
unused wlan_hdd_cfg80211_nan_*() stubs") removed the last reference to
typedef tSirNanEvent. Since this typedef is obsolete, remove it.

Change-Id: I7b7ef8f0bde00a77d95e3e1451e6138b01061bd7
CRs-Fixed: 2411194

core/mac/inc/sir_api.h

@@ -3038,11 +3038,6 @@ typedef struct {
 } tSirStatsExtEvent, *tpSirStatsExtEvent;
 #endif
 
-typedef struct {
-	uint32_t event_data_len;
-	uint8_t event_data[];
-} tSirNanEvent, *tpSirNanEvent;
-
 struct roam_offload_synch_ind {
 	uint16_t messageType;   /*eWNI_SME_ROAM_OFFLOAD_SYNCH_IND */
 	uint16_t length;