Misc: Backports from PCSX2 UI

src/frontend-common/input_manager.h

@@ -220,6 +220,10 @@ void ReloadBindings(SettingsInterface& si, SettingsInterface& binding_si);
 /// Re-parses the sources part of the config and initializes any backends.
 void ReloadSources(SettingsInterface& si, std::unique_lock<std::mutex>& settings_lock);
 
+/// Called when a device change is triggered by the system (DBT_DEVNODES_CHANGED on Windows).
+/// Returns true if any device changes are detected.
+bool ReloadDevices();
+
 /// Shuts down any enabled input sources.
 void CloseSources();