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
diff --git a/meta-quanta/meta-s6q/recipes-s6q/network/usb-ethernet-gadget.bb b/meta-quanta/meta-s6q/recipes-s6q/network/usb-ethernet-gadget.bb
new file mode 100644
index 0000000..6229879
--- /dev/null
+++ b/meta-quanta/meta-s6q/recipes-s6q/network/usb-ethernet-gadget.bb
@@ -0,0 +1,13 @@
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+FILESEXTRAPATHS:append := "${THISDIR}/${PN}:"
+SRC_URI:append = " file://00-bmc-usb0.network"
+
+FILES:${PN}:append = " ${sysconfdir_native}/systemd/network/00-bmc-usb0.network"
+
+do_install() {
+    install -d ${D}${sysconfdir_native}/systemd/network/
+    install -m 0644 ${WORKDIR}/00-bmc-usb0.network \
+        ${D}${sysconfdir_native}/systemd/network
+}