btrfs: check-integrity: split submit_bio from btrfsic checking

Require a separate call to the integrity checking helpers from the
actual bio submission.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>