f2fs: consolidate fsverity_info lookup

Look up the fsverity_info once in f2fs_mpage_readpages, and then use it
for the readahead, local verification of holes and pass it along to the
I/O completion workqueue in struct bio_post_read_ctx.  Do the same
thing in f2fs_get_read_data_folio for reads that come from garbage
collection and other background activities.

This amortizes the lookup better once it becomes less efficient.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20260202060754.270269-10-hch@lst.de
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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