Transceiver52M: Rename samples-per-symbol variable names

Because repeatedly typing mSamplesPerSymbol is giving me
carpal tunnel syndrome. Replace with the much shorter,
easier to type, and just as clear name of 'sps'.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
diff --git a/Transceiver52M/radioInterface.h b/Transceiver52M/radioInterface.h
index 94d8917..a64702b 100644
--- a/Transceiver52M/radioInterface.h
+++ b/Transceiver52M/radioInterface.h
@@ -52,7 +52,7 @@
 
   RadioClock mClock;                          ///< the basestation clock!
 
-  int samplesPerSymbol;			      ///< samples per GSM symbol
+  int sps;                                    ///< samples per GSM symbol
   int receiveOffset;                          ///< offset b/w transmit and receive GSM timestamps, in timeslots
 
   bool mOn;				      ///< indicates radio is on
@@ -94,10 +94,6 @@
   /** destructor */
   ~RadioInterface();
 
-  void setSamplesPerSymbol(int wSamplesPerSymbol) {if (!mOn) samplesPerSymbol = wSamplesPerSymbol;}
-
-  int getSamplesPerSymbol() { return samplesPerSymbol;}
-
   /** check for underrun, resets underrun value */
   bool isUnderrun();