net: mscc: ocelot: offload egress VLAN rewriting to VCAP ES0

VCAP ES0 is an egress VCAP operating on all outgoing frames.
This patch added ES0 driver to support vlan push action of tc filter.
Usage:

tc filter add dev swp1 egress protocol 802.1Q flower indev swp0 skip_sw \
        vlan_id 1 vlan_prio 1 action vlan push id 2 priority 2

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>