ARM11 exception handlers (not working yet, it fails to retrieve the data after the reboot)

Uncomment the appropriate line in firm.c to test.

exceptions/arm11/source/handlers.h

@@ -0,0 +1,14 @@
+/*
+*   handlers.h
+*       by TuxSH
+*
+*   This is part of Luma3DS, see LICENSE.txt for details
+*/
+
+#pragma once
+
+void __attribute__((noreturn)) mcuReboot(void);
+void FIQHandler(void);
+void undefinedInstructionHandler(void);
+void dataAbortHandler(void);
+void prefetchAbortHandler(void);