gpio: implement more of server library for boot sysmodule client usage

libraries/libstratosphere/include/stratosphere/gpio/gpio_api.hpp

@@ -16,10 +16,13 @@
 #pragma once
 #include <vapours.hpp>
 #include <stratosphere/gpio/gpio_types.hpp>
+#include <stratosphere/gpio/sf/gpio_sf_i_manager.hpp>
 
 namespace ams::gpio {
 
     void Initialize();
     void Finalize();
 
+    void InitializeWith(std::shared_ptr<gpio::sf::IManager> &&sp);
+
 }