iomap: drop pos param from __iomap_[get|put]_folio()

Both helpers take the iter and pos as parameters. All callers
effectively pass iter->pos, so drop the unnecessary pos parameter.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Link: https://lore.kernel.org/20250506134118.911396-4-bfoster@redhat.com


Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>