Add NXDN 1031 Hz Test Pattern

MMDVM.cpp

@@ -60,6 +60,7 @@ CCalDStarRX calDStarRX;
 CCalDStarTX calDStarTX;
 CCalDMR     calDMR;
 CCalP25     calP25;
+CCalNXDN    calNXDN;
 CCalRSSI    calRSSI;
 
 CCWIdTX cwIdTX;
@@ -107,6 +108,9 @@ void loop()
   if (m_modemState == STATE_P25CAL1K)
     calP25.process();
 
+  if (m_modemState == STATE_NXDNCAL1K)
+    calNXDN.process();
+
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }