memcg-v1: no need for memcg locking for writeback tracking

During the era of memcg charge migration, the kernel has to be make
sure that the writeback stat updates do not race with the charge
migration.  Otherwise it might update the writeback stats of the wrong
memcg.  Now with the memcg charge migration gone, there is no more race
for writeback stat updates and the previous locking can be removed.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Shakeel Butt <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Reviewed-by: Roman Gushchin <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Yosry Ahmed <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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