wlan: Link Layer Stats, implementation of interface Tx/Rx statistics

LLstats Implementation for Tx/Rx statistics

Change-Id: Id31c228b7e524b05a5509584b5e047c59c02303c
diff --git a/CORE/MAC/inc/sirApi.h b/CORE/MAC/inc/sirApi.h
index 0e0ee1a..2187b75 100644
--- a/CORE/MAC/inc/sirApi.h
+++ b/CORE/MAC/inc/sirApi.h
@@ -5103,11 +5103,11 @@
     // action frames transmit count
     tANI_U32            mgmtActionTx;
     // access Point Beacon and Management frames RSSI (averaged)
-    tANI_U32            rssiMgmt;
+    tANI_S32            rssiMgmt;
     // access Point Data Frames RSSI (averaged) from connected AP
-    tANI_U32            rssiData;
+    tANI_S32            rssiData;
     // access Point ACK RSSI (averaged) from connected AP
-    tANI_U32            rssiAck;
+    tANI_S32            rssiAck;
     // per ac data packet statistics
     tSirWifiWmmAcStat    AccessclassStats[WIFI_AC_MAX];
 } tSirWifiIfaceStat, *tpSirWifiIfaceStat;