bus/pci: fix IOVA as VA support for PowerNV
bus/pci: fix IOVA as VA support for PowerNV

Fix the IOMMU detection logic that looks for the "platform" field of
/proc/cpuinfo on POWER systems.

Fixes: 905215731833 ("bus/pci: support IOVA as VA on PowerNV systems")
Cc: stable@dpdk.org

Signed-off-by: David Christensen <9a876b0e626a7e524926f129e2e0ea9c4c104ff4@linux.vnet.ibm.com>
Reviewed-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk