filemap: Convert filemap_get_pages to use folios

This saves a few calls to compound_head(), including one in
filemap_update_page().  Shrinks the kernel by 78 bytes.

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