net/ice: refactor DCF VLAN handling

net/ice: refactor DCF VLAN handling

Since DCF always configure the outer VLAN offloads for the target AVF,
so rename the related variables to align with this design.

Also, the DCF needs to trace the AVF reset status to re-apply the VLAN
offload setting, refactor the reset event handling to support this.

Change the VF representor API 'ethdev' parameter to 'vf_rep_eth_dev' to
avoid introducing confusion with VF representor eth_dev ops name.

Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>