PRODINFO: Revamp blanking/write disallow policy. (#913)

* exo/fusee: hookup new prodinfo settings

* fusee: new scheme doesn't need FLAGS_DEFAULT

* fusee: fix c/p errors

* ams.mitm: completely revamp prodinfo backup mechanism

* ams.mitm: Implement revamped blanking/write policy

* strat: make early boot more debuggable

* exo: condense flag logic

stratosphere/boot/source/boot_power_utils.hpp

@@ -23,6 +23,7 @@ namespace ams::boot {
     void ShutdownSystem();
 
     /* Atmosphere power utilities. */
+    void SetInitialRebootPayload();
     void RebootForFatalError(ams::FatalErrorContext *ctx);
 
 }