wifi: Enable support for 80+80MHz when spectrum PHY is used

There is no sense to use non-contiguous operating channel with YANS

src/wifi/model/wifi-phy.cc

@@ -1144,8 +1144,6 @@ WifiPhy::SetOperatingChannel(const ChannelTuple& tuple)
 void
 WifiPhy::SetOperatingChannel(const ChannelSegments& channelSegments)
 {
-    NS_ASSERT_MSG(channelSegments.size() == 1,
-                  "Non-contiguous operating channel is not supported yet");
     NS_LOG_FUNCTION(this << +std::get<0>(channelSegments.front())
                          << std::get<1>(channelSegments.front())
                          << static_cast<WifiPhyBand>(std::get<2>(channelSegments.front()))

src/wifi/model/yans-wifi-phy.cc

@@ -141,6 +141,8 @@ void
 YansWifiPhy::FinalizeChannelSwitch()
 {
     NS_LOG_FUNCTION(this);
+    NS_ABORT_MSG_IF(GetOperatingChannel().GetNSegments() > 1,
+                    "operating channel made of non-contiguous segments cannot be used with Yans");
 }
 
 } // namespace ns3