Add support for Linksys EA6350 v3

[jeff]

@sammo see

[solved] VLANs on ipq40xx alternative config (for Fritzbox 4040)

At least in my experience, LuCI just doesn't "understand" the IPQ40xx switch and its driver. I don't know if the EA6350v3 is a dual-interface or single-interface device. My experience is with the EA8300 which presents eth0 and eth1 both. The guiding principles I use are based on looking at the code and coming to the conclusions that VLAN 1 and VLAN 2 are "special" -- avoid them The "Internet" port is "hard wired" to eth1 by the driver The "Ethernet" ports are "hard wired" to eth0 by the driv…