DATV demod: make sure that when baseband rate changes the channelizer is reconfigured to get all available bandwidth

plugins/channelrx/demoddatv/datvdemod.h

@@ -496,6 +496,8 @@ private:
 
     void ApplySettings();
 
+private slots:
+    void channelSampleRateChanged();
 };
 
 #endif // INCLUDE_DATVDEMOD_H

sdrbase/dsp/downchannelizer.h

@@ -68,6 +68,7 @@ public:
 
 	void configure(MessageQueue* messageQueue, int sampleRate, int centerFrequency);
 	int getInputSampleRate() const { return m_inputSampleRate; }
+	int getRequestedCenterFrequency() const { return m_requestedCenterFrequency; }
 
 	virtual void start();
 	virtual void stop();