fuse: convert fuse_add_dirent_to_cache() to use folios

Replace find_lock_page() and find_or_create_page() with
filemap_lock_folio() and filemap_grab_folio(), and switch the remaining
page helpers to their folio equivalents.

Each index of the readdir cache holds one page of dirents. fuse does not
enable large folios, so these folios are always a single page.

Also write the dirent with folio_fill_tail() and memcpy_to_folio()
instead of open-coding it.

This removes two hidden calls to compound_head() and one of the last
callers of find_lock_page().

Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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