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/SAP/inc/sapApi.h b/CORE/SAP/inc/sapApi.h
index 43c2e9d..c9f26e8 100644
--- a/CORE/SAP/inc/sapApi.h
+++ b/CORE/SAP/inc/sapApi.h
@@ -331,6 +331,11 @@
     v_MACADDR_t staMac;     /*MAC address of Station that is associated*/
     v_U8_t      assocId;        /*Association ID for the station that is associated*/
     v_U8_t      staId;            /*Station Id that is allocated to the station*/
+    v_U8_t      ShortGI40Mhz;
+    v_U8_t      ShortGI20Mhz;
+    v_U8_t      Support40Mhz;
+    v_U32_t     requestedMCRate;
+    tSirSupportedRates supportedRates;
 } tSap_AssocMacAddr, *tpSap_AssocMacAddr;
 
 /*struct corresponding to SAP_ASSOC_STA_CALLBACK_EVENT */