Instead of partially depending on vfio pin/unpin pages interface if
mdev is available, which would result in failure if vfio is not
on. But replace with a wrapper which need to be fixed till mdev
support got fully merged.
Cc: Jike Song <jike.song@intel.com> Cc: Xiaoguang Chen <xiaoguang.chen@intel.com> Reviewed-by: Xiaoguang Chen <Xiaoguang.chen@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>