isofs: convert the zisofs read path to use folios

Store folios in the array that zisofs_read_folio() passes to
zisofs_fill_pages() and zisofs_uncompress_block(), use the folio APIs on
them, and grab the folios with __filemap_get_folio() instead of
grab_cache_page_nowait(). This removes six compound_head() calls, from
page_offset(), the three SetPageUptodate() calls, unlock_page() and
put_page(), and the last struct page usage in isofs.

isofs only uses order-0 folios, so folio_size() is PAGE_SIZE and the
logic is unchanged.

grab_cache_page_nowait() passed FGP_NOFS as well, but FGP_NOWAIT already
prevents reclaim entirely, so leave it out, as FGP_NOFS is on its way
out [1].

Change poffset to be unsigned int rather than just unsigned while at
it.

[1] https://lore.kernel.org/linux-mm/20260830041901.2668-9-willy@infradead.org/

Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Link: https://patch.msgid.link/20260907-isofs-zisofs-folio-v2-1-c2e430abfcbc@columbia.edu
Signed-off-by: Jan Kara <jack@suse.cz>

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