Function btrfs_set_range_writeback() currently just sets the page
writeback unconditionally.

Change it to call the subpage helper so that we can handle both cases
well.

Since the subpage helpers needs btrfs_fs_info, also change the parameter
to accept btrfs_inode.

Tested-by: Ritesh Harjani <riteshh@linux.ibm.com> # [ppc64]
Tested-by: Anand Jain <anand.jain@oracle.com> # [aarch64]
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>