vDPA/ifcvf: cacheline alignment for ifcvf_hw

This commit introduces a new cacheline aligned layout for
ifcvf_hw.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20220222115428.998334-6-lingshan.zhu@intel.com


Signed-off-by: Michael S. Tsirkin <mst@redhat.com>