wlan: Add set MC rate IOCTL

Add capability to set MC rate through IOCTL interface.
Add iwpriv functionality also for testing reason.

Change-Id: Ie293b766410987f8814eb278ba14dc3eff11ea63
CRs-fixed: 532328
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index a34b92f..2a9b3c1 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -641,6 +641,13 @@
    tCsrRoamSetKey wepKey[CSR_MAX_NUM_KEY];
 
    beacon_data_t *beacon;
+
+   //Elements for setting MC rate with SAP mode
+   v_U32_t targetMCRate;
+   v_U32_t getStasCookie;
+   tSap_Event getStasEventBuffer;
+   tSap_AssocMacAddr *assocStasBuffer;
+   struct completion sap_get_associated_stas_complete;
 };
 
 struct hdd_mon_ctx_s