more etherswitch support

[Mori Hiroki]

Hi

I make two prototype for etherswitch support.

One is RealTek RTL8305SB. This chip is very old and first
vlan support product at RealTek. This chip support .1Q.
But PVID not support. I implement only Port base VLAN support
on RTL8305SB.

https://github.com/yamori813/freebsd/blob/zrouter/sys/dev/etherswitch/realtek/rtl830x.c


RTL8305SC support PVID. But I don't have it now.

Second is Infineon ADM6996FC/M support. This chip is very many
function. I'm confuse little bit.

https://github.com/yamori813/freebsd/blob/zrouter/sys/dev/etherswitch/infineon/adm6996fc.c


I use AR2317 and ADM6996FC router same as Netgear WGT624v4.

https://wikidevi.com/wiki/Netgear_WGT624v4


Also post review marvell mv88e6060 support.

https://reviews.freebsd.org/D8344


Regards

Hiroki Mori