mm: Move vmap_range from mm/ioremap.c to mm/vmalloc.c

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI
CVE: NA

https://lwn.net/ml/linux-kernel/20200825145753.529284-10-npiggin@gmail.com/


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This is a generic kernel virtual memory mapper, not specific to ioremap.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Rui Xiang <rui.xiang@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>