qcacld-3.0: Remove gLimDfs fields in tAniSirLim

The following DFS-related fields in tAniSirLim are no longer used, so
remove them:
- gLimDfsChanSwTxCount
- gLimDfsTargetChanNum

Change-Id: I093a7714018e4470e20c528f5bce199f5424367e
CRs-Fixed: 2379069

core/mac/inc/ani_global.h

@@ -676,9 +676,6 @@ typedef struct sAniSirLim {
 	uint8_t disassocMsgCnt;
 	uint8_t gLimIbssStaLimit;
 
-	/* Number of channel switch IEs sent so far */
-	uint8_t gLimDfsChanSwTxCount;
-	uint8_t gLimDfsTargetChanNum;
 	QDF_STATUS(*sme_msg_callback)
 		(struct mac_context *mac, struct scheduler_msg *msg);
 	QDF_STATUS(*stop_roaming_callback)