cryptodev: add crypto op helper macros
cryptodev: add crypto op helper macros

In order to facilitate the access to the private data,
after the crypto operation, two new macros have been
implemented:

- rte_crypto_op_ctod_offset(c,t,o), which returns a pointer
  to "o" bytes after the start of the crypto operation
  (rte_crypto_op)
- rte_crypto_op_ctophys_offset(c, o), which returns
  the physical address of the data "o" bytes after the
  start of the crypto operation (rte_crypto_op)

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Declan Doherty <b4388acd850cd8caad5000a112795063f04807ac@intel.com>
Acked-by: Akhil Goyal <74d7c4c993a22c1d4f60c46ff3d95c969a24a25c@nxp.com>
Acked-by: Fiona Trahe <7ba562cc372916cd557d0be347608f8b4da4f746@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk