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/include/stratosphere/ams/ams_environment.hpp

@@ -22,4 +22,8 @@ namespace ams {
     /* Will be called by libstratosphere on crash. */
     void CrashHandler(ThreadExceptionDump *ctx);
 
+    /* API for boot sysmodule. */
+    void InitializeForBoot();
+    void SetInitialRebootPayload(const void *src, size_t src_size);
+
 }