crypto: qat - add retrieval of fw capabilities

The QAT firmware provides a mechanism to retrieve its capabilities
through the init admin interface.

Add logic to retrieve the firmware capability mask from the firmware
through the init/admin channel. This mask reports if the
power management, telemetry and rate limiting features are supported.

The fw capabilities are stored in the accel_dev structure and are used
to detect if a certain feature is supported by the firmware loaded
in the device.

This is supported only by devices which have an admin AE.

Signed-off-by: Damian Muszynski <damian.muszynski@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>