zram: use a custom key for each zram object

Each struct zram uses the same key for its struct lockdep_map which is
used for locking analysis.

According to Sergey the lock chains might be different if zram1 is used
for and zram2 is for ext4.  This might lead to false dead lock reports if
it mixes a zram1 chain with a zram2.  This can be avoided if each lockmap
gets its own unique key.c

Use a dynamic lock_class_key for the table_lock_map.

Link: https://lore.kernel.org/20260714141300.3945672-3-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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