net: renesas: rswitch: enable only used MFWD features

net: renesas: rswitch: enable only used MFWD features

Currently, rswitch driver does not utilize most of MFWD forwarding
and processing features. It only uses port-based forwarding for ETHA
ports, and direct descriptor forwarding for GWCA port.

Update rswitch_fwd_init() to enable exactly that, and keep everything
else disabled.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>