[lib][bootimage] first stab at device side bootimage processing

Add lib/bootimage to parse in memory copies of bootimages
Add a few command line arguments to mkimage

tools/bootimage.h

@@ -23,7 +23,7 @@
 
 #pragma once
 
-#include "../include/bootimage.h"
+#include <lib/bootimage_struct.h>
 
 typedef struct bootimage bootimage;