filemap: Convert filemap_get_read_batch() to use a folio_batch

This change ripples all the way through the filemap_read() call chain and
removes a lot of messing about converting folios to pages and back again.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>