[fix] mm bugs (#7010)

* [fix] implementation fault on avl

* [fix] mm may free varea allocated statically

* [test] add test and benchmark for avl

libcpu/aarch64/common/mmu.c

@@ -205,6 +205,8 @@ void *rt_hw_mmu_map(rt_aspace_t aspace, void *v_addr, void *p_addr, size_t size,
 
         if (ret != 0)
         {
+            /* other types of return value are taken as programming error */
+            RT_ASSERT(ret == MMU_MAP_ERROR_NOPAGE);
             /* error, undo map */
             while (unmap_va != v_addr)
             {