Supports IPv4 flow offloading on MT7621 for Routing, SNAT and DNAT
Supported are regular ethernet->ethernet connections, including one
802.1q VLAN and/or PPPoE encapsulation
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>