crypto: qat - fix bar discovery for c62x

Some accelerators of the c62x series have only two bars.
This patch skips BAR0 if the accelerator does not have it.

Cc: <stable@vger.kernel.org>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>