mm: Exclude CDM marked VMAs from auto NUMA

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JMLR


CVE: NA
-------------------

Kernel cannot track device memory accesses behind VMAs containing CDM
memory. Hence all the VM_CDM marked VMAs should not be part of the auto
NUMA migration scheme. This patch also adds a new function is_cdm_vma()
to detect any VMA marked with flag VM_CDM.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Lijun Fang <fanglijun3@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>