crypto: qat - remove unnecessary tests to detect PFVF support

Previously, the GEN4 host driver supported SR-IOV but had no working
implementation of the PFVF protocol to communicate with VF drivers.
Since all the host drivers for QAT devices now support both SR-IOV and
PFVF, remove the old and unnecessary checks to test PFVF support.

Signed-off-by: Marco Chiappero <marco.chiappero@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>