net/mlx5e: MPLSoUDP decap, use vlan push_eth instead of pedit

Currently action pedit of source and destination MACs is used
to fill the MACs in L2 push step in MPLSoUDP decap offload,
this isn't aligned to tc SW which use vlan eth_push action
to do this.

To fix that, offload support for vlan veth_push action is
added together with mpls pop action, and deprecate the use
of pedit of MACs.

Flow example:
filter protocol mpls_uc pref 1 flower chain 0
filter protocol mpls_uc pref 1 flower chain 0 handle 0x1
  eth_type 8847
  mpls_label 555
  enc_dst_port 6635
  in_hw in_hw_count 1
        action order 1: tunnel_key  unset pipe
         index 2 ref 1 bind 1
        used_hw_stats delayed

        action order 2: mpls  pop protocol ip pipe
         index 2 ref 1 bind 1
        used_hw_stats delayed

        action order 3: vlan  push_eth dst_mac de:a2:ec:d6:69:c8 src_mac de:a2:ec:d6:69:c8 pipe
         index 2 ref 1 bind 1
        used_hw_stats delayed

        action order 4: mirred (Egress Redirect to device enp8s0f0_0) stolen
        index 2 ref 1 bind 1
        used_hw_stats delayed

Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>