crypto: qat - add internal timer for qat 4xxx

The power management feature in QAT 4xxx devices can disable clock
sources used to implement timers. Because of that, the firmware needs to
get an external reliable source of time.

Add a kernel delayed work that periodically sends an event to the
firmware. This is triggered every 200ms. At each execution, the driver
sends a sync request to the firmware reporting the current timestamp
counter value.

This is a pre-requisite for enabling the heartbeat, telemetry and
rate limiting features.

Signed-off-by: Damian Muszynski <damian.muszynski@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>