s390/zcrypt: make structures static

Get rid of these:
drivers/s390/crypto/ap_card.c:140:20:
  warning: symbol 'ap_card_type' was not declared. Should it be static?
drivers/s390/crypto/ap_queue.c:567:20:
 warning: symbol 'ap_queue_type' was not declared. Should it be static?

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>