Move fdt handling logic out of main.c.
This is in preparation for having archs/platforms that don't use FDT.
diff --git a/inc/mm.h b/inc/mm.h
index 9c129d4..3a5c691 100644
--- a/inc/mm.h
+++ b/inc/mm.h
@@ -38,6 +38,11 @@
paddr_t paddr, int mode);
bool mm_ptable_map_page(struct mm_ptable *t, vaddr_t va, paddr_t pa, int mode);
bool mm_ptable_unmap(struct mm_ptable *t, vaddr_t begin, vaddr_t end, int mode);
-void mm_ptable_defrag(struct mm_ptable *t);
+void mm_ptable_defrag(struct mm_ptable *t, int mode);
+
+bool mm_init(void);
+bool mm_map(vaddr_t begin, vaddr_t end, paddr_t paddr, int mode);
+bool mm_unmap(vaddr_t begin, vaddr_t end, int mode);
+void mm_defrag(void);
#endif /* _MM_H */