qcacld-3.0: Define setKeepAlive ioctl with proper arguments

Define proper set arguments for setKeepAlive ioctl by Passing
sizeof setKeepAlive request parameter structure.

Change-Id: I4699fecb24f6b3c927e8b7c8263a611b354914a3
CRs-Fixed: 955411

core/hdd/src/wlan_hdd_wext.c

@@ -10995,7 +10995,8 @@ static const struct iw_priv_args we_private_args[] = {
 
 	{
 		WLAN_SET_KEEPALIVE_PARAMS,
-		sizeof(tSirKeepAliveReq) | IW_PRIV_SIZE_FIXED,
+		IW_PRIV_TYPE_BYTE | sizeof(tSirKeepAliveReq) |
+		IW_PRIV_SIZE_FIXED,
 		0,
 		"setKeepAlive"
 	}