memcg: separate local_trylock for memcg and obj

The per-cpu stock_lock protects cached memcg and cached objcg and their
respective fields.  However there is no dependency between these fields
and it is better to have fine grained separate locks for cached memcg and
cached objcg.  This decoupling of locks allows us to make the memcg charge
cache and objcg charge cache to be nmi safe independently.

At the moment, memcg charge cache is already nmi safe and this decoupling
will allow to make memcg charge cache work without disabling irqs.

Link: https://lkml.kernel.org/r/20250506225533.2580386-3-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Eric Dumaze <edumazet@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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