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/smeInside.h b/CORE/SME/inc/smeInside.h
index e983d01..3329d3f 100644
--- a/CORE/SME/inc/smeInside.h
+++ b/CORE/SME/inc/smeInside.h
@@ -302,8 +302,20 @@
                                           tANI_U8 sessionId,
                                           tSirMacAddr peerMac,
                                           tCsrTdlsLinkEstablishParams *tdlsLinkEstablishParams);
-eHalStatus csrTdlsAddPeerSta(tHalHandle hHal, tANI_U8 sessionId, tSirMacAddr peerMac);
-eHalStatus csrTdlsChangePeerSta(tHalHandle hHal, tANI_U8 sessionId, tSirMacAddr peerMac, tCsrStaParams *pstaParams);
+eHalStatus csrTdlsAddPeerSta(tHalHandle hHal, tANI_U8 sessionId,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+                             const tSirMacAddr peerMac
+#else
+                             tSirMacAddr peerMac
+#endif
+                             );
+eHalStatus csrTdlsChangePeerSta(tHalHandle hHal, tANI_U8 sessionId,
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,18,0))
+                                const tSirMacAddr peerMac,
+#else
+                                tSirMacAddr peerMac,
+#endif
+                                tCsrStaParams *pstaParams);
 eHalStatus csrTdlsDelPeerSta(tHalHandle hHal, tANI_U8 sessionId, tSirMacAddr peerMac);
 eHalStatus csrTdlsProcessCmd(tpAniSirGlobal pMac,tSmeCmd *pCommand );
 eHalStatus csrTdlsProcessLinkEstablish( tpAniSirGlobal pMac, tSmeCmd *cmd );