[mm]修复unmap内存时遗漏刷新地址转换表的问题，避免dcache(PIPT)出错

Author: heyuanjie87

components/mm/mm_anon.c

@@ -134,7 +134,7 @@ static void _pgmgr_pop_all(rt_varea_t varea)
         char *page_va = rt_kmem_p2v(page_pa);
         if (page_pa != ARCH_MAP_FAILED && page_va)
         {
-            rt_hw_mmu_unmap(aspace, iter, ARCH_PAGE_SIZE);
+            rt_varea_unmap_page(varea, iter);
             rt_pages_free(page_va, 0);
         }
     }