zram: support priority parameter in recompression

recompress device attribute supports alg=NAME parameter so that we can
specify only one particular algorithm we want to perform recompression
with.  However, with algo params we now can have several exactly same
secondary algorithms but each with its own params tuning (e.g.  priority 1
configured to use more aggressive level, and priority 2 configured to use
a pre-trained dictionary).  Support priority=NUM parameter so that we can
correctly determine which secondary algorithm we want to use.

Link: https://lkml.kernel.org/r/20240902105656.1383858-25-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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