meta-quanta: s6q: Add usb0 network interface

1. Fix the sytle of systemd-conf.bbappend to wrap with 80 characters.
2. Add usb0 network interface.
3. Disable ipv4 link-local address to avoid routing

meta-quanta: s6q: Add usb0 network interface

1. Fix the sytle of systemd-conf.bbappend to wrap with 80 characters.
2. Add usb0 network interface.
3. Disable ipv4 link-local address to avoid routing problems.

Tested:
Set the host's network interface to a link-local address and
successfully communicate with the BMC via usb0.

Signed-off-by: Jerry Wan <jerry.wan@quantatw.com>
Change-Id: I9e6a9946a2beb8cf85872abe1919e92052fe46cc

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