Add code to avoid automatic clearing of VF stats on a function
reset or a stat context free.
Add rte_pmd_bnxt_set_vf_persist_stats() PMD specific API.
Fixes: dd46c6bbd5d6 ("net/bnxt: support get and clear VF specific stats")
Signed-off-by: Stephen Hurd <stephen.hurd@broadcom.com>
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>