ext4: switch to using ext4_do_writepages() for ordered data writeout

Use the standard writepages method (ext4_do_writepages()) to perform
writeout of ordered data during journal commit.

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20221207112722.22220-8-jack@suse.cz


Signed-off-by: Theodore Ts'o <tytso@mit.edu>