fs.mitm: Implement basic passthrough framework for input commands.

stratosphere/fs_mitm/source/fsmitm_service.cpp

@@ -0,0 +1,12 @@
+#include <switch.h>
+#include "fsmitm_service.hpp"
+
+Result FsMitMService::dispatch(IpcParsedCommand &r, IpcCommand &out_c, u64 cmd_id, u8 *pointer_buffer, size_t pointer_buffer_size) {
+    Result rc = 0xF601;
+    return rc;
+}
+
+Result FsMitMService::handle_deferred() {
+    /* This service is never deferrable. */
+    return 0;
+}