mm/mm.h: add mm_free_delaylist interface

This adds explicit `void mm_free_delaylist(heap)` interface so that
to force freeing the heap's delaylist.

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>

mm/mm_heap/mm_malloc.c

@@ -137,6 +137,22 @@ void mm_mempool_dump_handle(FAR struct mempool_s *pool, FAR void *arg)
  * Public Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: mm_free_delaylist
+ *
+ * Description:
+ *   force freeing the delaylist of this heap.
+ *
+ ****************************************************************************/
+
+void mm_free_delaylist(FAR struct mm_heap_s *heap)
+{
+  if (heap)
+    {
+       free_delaylist(heap, true);
+    }
+}
+
 /****************************************************************************
  * Name: mm_malloc
  *

mm/tlsf/mm_tlsf.c

@@ -1447,3 +1447,19 @@ FAR void *mm_zalloc(FAR struct mm_heap_s *heap, size_t size)
 
   return alloc;
 }
+
+/****************************************************************************
+ * Name: mm_free_delaylist
+ *
+ * Description:
+ *   force freeing the delaylist of this heap.
+ *
+ ****************************************************************************/
+
+void mm_free_delaylist(FAR struct mm_heap_s *heap)
+{
+  if (heap)
+    {
+       free_delaylist(heap, true);
+    }
+}