fusee: Complete re-write of the hardware initialization code:

- Updated code to match hekate's;
- Improved nxboot (now boots firmwares 2.x successfully);
- Temporarily disabled built-in boot system module support;
- Fixed multiple bugs.

fusee/fusee-secondary/src/cluster.h

@@ -0,0 +1,6 @@
+#ifndef FUSEE_CLUSTER_H_
+#define FUSEE_CLUSTER_H_
+
+void cluster_boot_cpu0(uint32_t entry);
+
+#endif