crypto/qat: move to using new device structure

crypto/qat: move to using new device structure

Struct qat_pmd_private held the data needed by cryptodev, common code
now gets most data from struct qat_pci_device instead. qat_pmd_private
is trimmed to hold only sym crypto data and renamed qat_sym_private
to reflect its usage.
Specifically
 - remove max_nb_queue_pairs from qat_pmd_private, get from qp_hw_data
 - remove max_nb_sesssions from qat_pmd_private as not needed.
 - remove qat_gen from qat_pmd_private, get from qat_pci_device instead.
 - use qat_pci_device throughout common code instead of qat_pmd_private
 - rename qat_pmd_private to qat_sym_dev_private - this now holds only
   sym-specific data for the cryptodev API
 - extend pci device name to <bdf>_qat for clarity, was just <bdf>
 - update qp mem and cookiepool names to reflect the appropriate device,
   service and qp.
 - rename qat_dev_info_get() to qat_sym_dev_info_get() as mostly sym,
   not enough common info to warrant a generic fn.

Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>