multi-arfcn, trx: remove unused attach call()

At one point an attach() call was used to connect
multiple transceivers to the radio interface. The
current approach is to pass the radio interface to
the transceiver instances through the constructor.
Remove the unused and deprecated call.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

Transceiver52M/radioInterface.h

@@ -94,6 +94,7 @@ public:
 
   /** start the interface */
   bool start();
+
   bool started() { return mOn; };
 
   /** shutdown interface */
@@ -115,9 +116,6 @@ public:
   /** check for underrun, resets underrun value */
   bool isUnderrun();
   
-  /** attach an existing USRP to this interface */
-  void attach(RadioDevice *wRadio, int wRadioOversampling);
-
   /** return the receive FIFO */
   VectorFIFO* receiveFIFO(int num) { return &mReceiveFIFO[num];}