Add custom pm sysmodule

sysmodules/pm/source/firmlaunch.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <3ds/types.h>
+
+void mapFirmlaunchParameters(void);
+Result GetFirmlaunchParams(void *outParams, size_t size);
+Result SetFirmlaunchParams(const void *params, size_t size);
+Result LaunchFirm(u32 firmTidLow, const void *params, size_t size);