crypto: qat - factor out AER reset helpers

crypto: qat - factor out AER reset helpers

Move the shutdown and recovery sequences out of adf_error_detected()
and adf_slot_reset() into reset_prepare() and reset_done() helpers.

This makes the AER recovery path easier to follow and prepares the
common reset flow for reuse by additional PCI reset callbacks without
duplicating the logic.

No functional change intended.

Cc: stable@vger.kernel.org
Signed-off-by: Ahsan Atta <ahsan.atta@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>