qcacld-3.0: Remove typedef tAni64BitCounters

Previous change I112d7ffb9a7d1b011f37ce2893cb0149a5703da7
("qcacld-3.0: Remove typedef tAniSecurityStat") removed the last
references to typedef tAni64BitCounters, so remove it as well.

Change-Id: I9327c3654acd10ed6e535748f322546578f14afc
CRs-Fixed: 2363223

core/mac/inc/sir_api.h

@@ -1343,11 +1343,6 @@ typedef struct sSirSmeTkipCntrMeasReq {
 	bool bEnable;           /* Start/stop countermeasures */
 } qdf_packed tSirSmeTkipCntrMeasReq, *tpSirSmeTkipCntrMeasReq;
 
-typedef struct sAni64BitCounters {
-	uint32_t Hi;
-	uint32_t Lo;
-} tAni64BitCounters, *tpAni64BitCounters;
-
 typedef enum sPacketType {
 	ePACKET_TYPE_UNKNOWN,
 	ePACKET_TYPE_11A,