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There are no callers of mem_cgroup_event_ratelimit() in the v2 code.  Move
it to v1 only code and rename it to memcg1_event_ratelimit().

Link: https://lkml.kernel.org/r/20240815050453.1298138-3-shakeel.butt@linux.dev

Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: T.J. Mercier <tjmercier@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>