add nativeapis

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/reference/native-apis/native__avmemory_8h.md

+# native_avmemory.h
+
+
+## Overview
+
+Declares the memory-related functions.
+
+**Since:**
+9
+
+**Related Modules:**
+
+[Core](_core.md)
+
+
+## Summary
+
+
+
+### Functions
+
+| Name | Description | 
+| -------- | -------- |
+| [OH_AVMemory_GetAddr](_core.md#oh_avmemory_getaddr) (struct OH_AVMemory \*mem) | Obtains the virtual memory address of an **OH_AVMemory** instance.  | 
+| [OH_AVMemory_GetSize](_core.md#oh_avmemory_getsize) (struct OH_AVMemory \*mem) | Obtains the memory size of an **OH_AVMemory** instance.  |