UPSTREAM: f2fs: convert f2fs_read_multi_pages() to use folio

Convert to use folio, so that we can get rid of 'page->index' to
prepare for removal of 'index' field in structure page [1].

[1] https://lore.kernel.org/all/Zp8fgUSIBGQ1TN0D@casper.infradead.org/



Cc: Matthew Wilcox <willy@infradead.org>
Change-Id: I9707bad9f55f3dab40ad4cd294dc8a74798f2aec
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 3981e942)