fuse: use iomap helper to mark folio uptodate

When fuse enables large folios, a large folio will be backed by
iomap_folio_state that keeps track of uptodate and dirty state in an
internal bitmap.

Fuse writethrough and notify store paths currently set folio uptodate
state with folio_mark_uptodate(), which touches only the folio-level
flag, but on an iomap-backed folio, that leaves the uptodate bitmap out
of sync.

Use the iomap_folio_mark_uptodate() helper to update both the folio
uptodate state and the iomap uptodate bitmap.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Link: https://patch.msgid.link/20260707220450.1200943-4-joannelkoong@gmail.com
Acked-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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