删除OsVmPhysFreeListAdd/OsVmPhysFreeListAddUnsafe、OsVmPhysFreeListDel/OsVmPhysFreeListDelUnsafe两对内部函数内容重复的部分。

close #I4FL95
Signed-off-by: Nkenneth <zhushangyuan@huawei.com>