Fix LF/MF RX centering with adaptive FS4 tuning (#3319)

* Fix LF/MF RX tuning with adaptive FS4 shift

* Enable adaptive FS4 tuning in Waterfall Designer

firmware/common/message.hpp

@@ -171,6 +171,7 @@ class Message {
         TetraBsch = 113,
         TetraDnb = 114,
         AudioDDCConfig = 115,
+        RxFs4Config = 116,
         MAX
     };
 
@@ -311,6 +312,18 @@ class SpectrumStreamingConfigMessage : public Message {
     Mode mode{Mode::Stopped};
 };
 
+// Application sample-rate translation, independent of PRALINE's AFE shift.
+enum class RxFs4Direction : uint8_t { Down,
+                                      Up };
+
+class RxFs4ConfigMessage : public Message {
+   public:
+    constexpr RxFs4ConfigMessage(RxFs4Direction direction)
+        : Message{ID::RxFs4Config}, direction{direction} {}
+
+    const RxFs4Direction direction;
+};
+
 class AudioDDCConfigMessage : public Message {
    public:
     constexpr AudioDDCConfigMessage(int32_t frequency)