m324: Fix core

Now uses the new header

Signed-off-by: Michel Pollet <buserror@gmail.com>

Author: buserror

simavr/cores/sim_mega324.c

@@ -26,7 +26,7 @@
 
 #define _AVR_IO_H_
 #define __ASSEMBLER__
-#include "avr/iom324p.h"
+#include "avr/iom324.h"
 
 /* borken avr-libc missing these declarations :/ */
 /* The one from 324a are also wrong, like, I'm embarassed for whomever