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

libraries/libstratosphere/source/ams/ams_bpc.h

@@ -28,6 +28,7 @@ void amsBpcExit(void);
 Service *amsBpcGetServiceSession(void);
 
 Result amsBpcRebootToFatalError(void *ctx);
+Result amsBpcSetInitialPayload(const void *src, size_t src_size);
 
 #ifdef __cplusplus
 }