bus/pci: fix UIO bind check

bus/pci: fix UIO bind check

When checking if any devices bound to uio, we did not exclude
those which are blacklisted (or in the case that a whitelist
is specified).

This patch fixes it by only checking whitelisted devices, or
not-blacklisted devices depending on the bus scan mode.

Fixes: 815c7deaed2d ("pci: get IOMMU class on Linux")

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Reviewed-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>