crypto: qat - add namespace to driver

Create CRYPTO_QAT namespace for symbols exported by the qat_common
module and import those in the QAT drivers. It will reduce the global
namespace crowdedness and potential misuse or the API.

This does not introduce any functional change.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>