ascend inclusion
category: bugfix
bugzilla: NA
CVE: NA

------------

ddr_totalram_pages() return totalram_pages remain unchanged
when cdmnode not set.

Fixes: da9b9592e18f ("mm: Change tmpfs size base on ddr size.")
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>