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_environment.cpp

@@ -36,6 +36,14 @@ namespace ams {
 
     extern ncm::ProgramId CurrentProgramId;
 
+    void InitializeForBoot() {
+        R_ABORT_UNLESS(amsBpcInitialize());
+    }
+
+    void SetInitialRebootPayload(const void *src, size_t src_size) {
+        R_ABORT_UNLESS(amsBpcSetInitialPayload(src, src_size));
+    }
+
     void WEAK_SYMBOL ExceptionHandler(FatalErrorContext *ctx) {
         R_ABORT_UNLESS(amsBpcInitialize());
         R_ABORT_UNLESS(amsBpcRebootToFatalError(ctx));