s390/zcrypt: fix wrong format specifications

Fixes 5 wrong format specification findings found by the
kernel test robot in ap_queue.c:

warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
                               __func__, status.response_code,

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 2ea2a609

 ("s390/ap: add error response code field for ap queue devices")
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>