osmo-trx: Add an option to swap channels on UmTRX.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
diff --git a/Transceiver52M/radioDevice.h b/Transceiver52M/radioDevice.h
index 6273bcc..dd4928c 100644
--- a/Transceiver52M/radioDevice.h
+++ b/Transceiver52M/radioDevice.h
@@ -41,7 +41,7 @@
                            bool diversity = false, double offset = 0.0);
 
   /** Initialize the USRP */
-  virtual int open(const std::string &args = "", bool extref = false)=0;
+  virtual int open(const std::string &args = "", bool extref = false, bool swap_channels = false)=0;
 
   virtual ~RadioDevice() { }