wlan: Populate only 5GHz channel for Supported channel IE.

Driver populate all channels for Supported Channel IE.
Channels Supported channels IE is valid only 5GHz band as it is
present only if DFS is required.

As part of fix fill only 5Ghz channels in the channel list for the
IE.

CRs-Fixed: 855857
Change-Id: If83ef92b7e1466a3898fd9d053712e4bb71a97cd
diff --git a/CORE/SME/src/csr/csrApiRoam.c b/CORE/SME/src/csr/csrApiRoam.c
index 603a373..532e74a 100644
--- a/CORE/SME/src/csr/csrApiRoam.c
+++ b/CORE/SME/src/csr/csrApiRoam.c
@@ -12915,12 +12915,18 @@
     }
     size = sizeof(pMac->roam.validChannelList);
     if(HAL_STATUS_SUCCESS(csrGetCfgValidChannels(pMac, (tANI_U8 *)pMac->roam.validChannelList, &size)))
-    { 
-        *pBuf++ = (tANI_U8)size;        //tSirSupChnl->numChnl        
-        for ( i = 0; i < size; i++) 
+    {
+        tANI_U8 *actualSize = pBuf++;
+        *actualSize = 0;
+
+        for ( i = 0; i < size; i++)
         {
-            *pBuf++ = pMac->roam.validChannelList[ i ];   //tSirSupChnl->channelList[ i ]
-             
+            /* Only add 5ghz channels*/
+            if (CSR_IS_CHANNEL_5GHZ(pMac->roam.validChannelList[ i ]))
+            {
+                 *actualSize +=1;
+                 *pBuf++ = pMac->roam.validChannelList[ i ];
+            }
         }
     }
     else