qcacld-3.0: Remove enableVhtFor24GHz from tCsrConfigParam

Change I8cd30439d7ac3de7b550aa5042353cf30e04cbda ("qcacld-3.0:
Refactor MLME CFG items and APIs for VHT") removed the usage of the
enableVhtFor24GHz field in tCsrConfigParam, but failed to remove the
actual field, so remove it now.

Change-Id: Id80c1a85c9269b3bcc6019426f5321665bc93f2e
CRs-Fixed: 2380774

core/sme/inc/csr_api.h

@@ -998,7 +998,6 @@ typedef struct tagCsrConfigParam {
 	 * request from HDD
 	 */
 	bool fScanTwice;
-	bool enableVhtFor24GHz;
 	bool vendor_vht_sap;
 	bool send_smps_action;