s390/zcrypt: add new low level ep11 functions support file

This patch introduces two new files which provide some
low level functions to interact with EP11 crypto cards:

ep11_get_card_info() sends an EP11 query module info CPRB to the
  addressed card, processes the returning reply and exposes some of
  the information returned in the new ep11_card_info struct.

ep11_get_domain_info() sends an EP11 query domain info CPRB to the
  addressed card/queue, processes the returning reply and exposes some
  of the information returned in the new ep11_domain_info struct.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>