f2fs: Convert submit tracepoints to take a folio

Remove accesses to page->index and page->mapping as well as
unnecessary calls to page_file_mapping().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>