sandbox: vm: add function to iterate though pages in a hugepage

sandbox/vm/page.c

@@ -260,3 +260,13 @@ vm_page_t *vm_page_get_buddy(vm_page_t *pg)
 	paddr = paddr ^ vm_page_order_to_bytes(pg->p_order);
 	return vm_page_get(paddr);
 }
+
+vm_page_t *vm_page_get_next_tail(vm_page_t *pg)
+{
+	vm_page_t *next = pg + 1;
+	if (next->p_flags & VM_PAGE_HEAD || !(next->p_flags & VM_PAGE_HUGE)) {
+		return NULL;
+	}
+
+	return next;
+}