EU regions merge (#10675)

* stronger together

* validate 2.4ghz regions

* less noise

* you're right, and that shapens the analysis significantly

* sassy rejoinder

src/mesh/SX128xInterface.h

@@ -19,6 +19,9 @@ template <class T> class SX128xInterface : public RadioLibInterface
 
     virtual bool wideLora() override;
 
+    /// SX128x is a 2.4 GHz-only chip; it cannot tune sub-GHz regions
+    virtual bool supportsSubGhz() override { return false; }
+
     /// Apply any radio provisioning changes
     /// Make sure the Driver is properly configured before calling init().
     /// \return true if initialisation succeeded.