core: Remove unused private Init function for the System class

This isn't used, so it can be removed.

src/core/core.cpp

@@ -444,6 +444,10 @@ void System::InvalidateCpuInstructionCaches() {
     impl->kernel.InvalidateAllInstructionCaches();
 }
 
+void System::Shutdown() {
+    impl->Shutdown();
+}
+
 System::ResultStatus System::Load(Frontend::EmuWindow& emu_window, const std::string& filepath) {
     return impl->Load(*this, emu_window, filepath);
 }
@@ -752,14 +756,6 @@ const System::CurrentBuildProcessID& System::GetCurrentProcessBuildID() const {
     return impl->build_id;
 }
 
-System::ResultStatus System::Init(Frontend::EmuWindow& emu_window) {
-    return impl->Init(*this, emu_window);
-}
-
-void System::Shutdown() {
-    impl->Shutdown();
-}
-
 Service::SM::ServiceManager& System::ServiceManager() {
     return *impl->service_manager;
 }

src/core/core.h

@@ -388,14 +388,6 @@ public:
 private:
     System();
 
-    /**
-     * Initialize the emulated system.
-     * @param emu_window Reference to the host-system window used for video output and keyboard
-     *                   input.
-     * @return ResultStatus code, indicating if the operation succeeded.
-     */
-    [[nodiscard]] ResultStatus Init(Frontend::EmuWindow& emu_window);
-
     struct Impl;
     std::unique_ptr<Impl> impl;