Revert "dm space maps: don't reset space map allocation cursor when committing"

hulk inclusion
category: bugfix
bugzilla: 185894, https://gitee.com/openeuler/kernel/issues/I4MITL


CVE: NA

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This reverts commit 38cb5d45.

Signed-off-by: Luo Meng <luomeng12@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>