Add init code for mapper

init_mapper now remaps so that it can change irq vectors

sw/kernel/devices/mapper.h

@@ -0,0 +1,10 @@
+#ifndef _MAPPER_H
+#define _MAPPER_H
+
+#include <stdint.h>
+
+void init_mapper();
+
+void map(uint16_t p_page, uint8_t v_page); 
+
+#endif