net/bnxt: fix restoring VLAN filtering after recovery

net/bnxt: fix restoring VLAN filtering after recovery

During port start, driver calls bnxt_vlan_offload_set_op()
to program VLAN Filter/VLAN Strip setting to the HW. This
in turns add the vlan filters.

This results in a failure when bnxt_restore_filters() invokes
bnxt_restore_vlan_filters() during the recovery as the vlans are
already programmed.

Fix to ignore the error(-EEXIST).

Fixes: 151c8240ac6a ("net/bnxt: restore VLAN filters during reset recovery")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>