s390/dasd: fix build warning in dasd_eckd_build_cp_raw

Commit 72deb455 ("block: remove CONFIG_LBDAF") changes
sector_t to u64 unconditionaly, so apply '%llu' for print
sector_t variable.

Fixes: 72deb455 ("block: remove CONFIG_LBDAF")
Cc: linux-s390@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>