raid6/kunit: add a benchmark

Add a benchmark to test the RAID 6 P/Q functions for more representative
block sizes and numbers of disks.  This splits the maximum alloc size used
for the benchmark from the max size for the kunit test because recovery is
currently limited to a single page at a time.  Hopefully this will be
fixed soon.

The runtime numbers are reported in GB/s as the numbers of modern
implementations are basically unreadable as MB/s.  This means
retro-architectures could report 0, but that is an easy tradeoff.

Link: https://lore.kernel.org/20260715144825.95432-9-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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