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/utils.c

@@ -6,7 +6,7 @@
 #include "pmc.h"
 #include "car.h"
 #include "timers.h"
-#include "hwinit/btn.h"
+#include "btn.h"
 #include "panic.h"
 
 #include <stdio.h>