wlan: Sessionize Link Layer Stats to support multiple interfaces.

This commit ensures that the proper mapping of the interface and the
station index is done to ensure that appropriate statistics per interface
are obtained.

Change-Id: I676137b60c3313bdd5bf91ce03ec17d73dae041e
CRs-Fixed:  689878
diff --git a/CORE/MAC/inc/sirApi.h b/CORE/MAC/inc/sirApi.h
index 25e4c9c..c865ba2 100644
--- a/CORE/MAC/inc/sirApi.h
+++ b/CORE/MAC/inc/sirApi.h
@@ -4769,7 +4769,7 @@
 typedef struct
 {
   u32 reqId;
-  u8  staId;
+  tSirMacAddr  macAddr;
   u32 mpduSizeThreshold;
   u32 aggressiveStatisticsGathering;
 }tSirLLStatsSetReq, *tpSirLLStatsSetReq;
@@ -4777,14 +4777,14 @@
 typedef struct
 {
   u32 reqId;
-  u8  staId;
+  tSirMacAddr  macAddr;
   u32 paramIdMask;
 }tSirLLStatsGetReq, *tpSirLLStatsGetReq;
 
 typedef struct
 {
   u32  reqId;
-  u8   staId;
+  tSirMacAddr  macAddr;
   u32  statsClearReqMask;
   u8   stopReq;
 }tSirLLStatsClearReq, *tpSirLLStatsClearReq;