wlan: constify MAC address in cfg80211 for 3.18 support

The following cfg80211 interfaces constify the MAC addr params.
So make the corresonding changes to adapt the  new interface.

.add_station
.change_station
.del_station
.get_station

Change-Id: I09c64a33039db6bd7c3c72afd1d30486ea03d142
CRs-fixed: 882885
diff --git a/CORE/SME/inc/sme_Api.h b/CORE/SME/inc/sme_Api.h
index d8defd9..5a52661 100644
--- a/CORE/SME/inc/sme_Api.h
+++ b/CORE/SME/inc/sme_Api.h
@@ -46,6 +46,7 @@
 /*--------------------------------------------------------------------------
   Include Files
   ------------------------------------------------------------------------*/
+#include <linux/version.h>
 #include "ccmApi.h"
 #include "csrApi.h"
 #include "pmcApi.h"
@@ -3270,7 +3271,12 @@
     \param  staParams - Peer Station Parameters.
     \- return VOS_STATUS_SUCCES
     -------------------------------------------------------------------------*/
-VOS_STATUS sme_ChangeTdlsPeerSta(tHalHandle hHal, tANI_U8 sessionId, tSirMacAddr peerMac,
+VOS_STATUS sme_ChangeTdlsPeerSta(tHalHandle hHal, tANI_U8 sessionId,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+                                 const tSirMacAddr peerMac,
+#else
+                                 tSirMacAddr peerMac,
+#endif
                                  tCsrStaParams *pstaParams);
 /* ---------------------------------------------------------------------------
     \fn sme_AddTdlsPeerSta
@@ -3279,7 +3285,13 @@
     \param  peerMac - peer's Mac Adress.
     \- return VOS_STATUS_SUCCES
     -------------------------------------------------------------------------*/
-VOS_STATUS sme_AddTdlsPeerSta(tHalHandle hHal, tANI_U8 sessionId, tSirMacAddr peerMac);
+VOS_STATUS sme_AddTdlsPeerSta(tHalHandle hHal, tANI_U8 sessionId,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+                              const tSirMacAddr peerMac
+#else
+                              tSirMacAddr peerMac
+#endif
+                              );
 /* ---------------------------------------------------------------------------
     \fn sme_DeleteTdlsPeerSta
     \brief  API to Delete TDLS peer sta entry.
@@ -3500,7 +3512,11 @@
                                             tANI_U8 channel);
 
 eHalStatus sme_RoamDelPMKIDfromCache( tHalHandle hHal, tANI_U8 sessionId,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+                                      const tANI_U8 *pBSSId,
+#else
                                       tANI_U8 *pBSSId,
+#endif
                                       tANI_BOOLEAN flush_cache );
 
 void smeGetCommandQStatus( tHalHandle hHal );