RDMA/hns: Don't set the HW stats ops for VF and HIP08

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DJVZ



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As HW stats are not supported for VF and HIP08, just don't set the
HW stats ops to ib-core in these cases.

Fixes: 8681236b9ca9 ("Revert "RDMA/hns: Add dfx cnt stats"")
Fixes: 05491dda ("RDMA/hns: Support hns HW stats")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>