meta-google: google-usb-network: Bring link up after rename

Otherwise it will remain down in some instances.

Change-Id: I1878ff533eceed950799f513789f3b801a478c52
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/networking/google-usb-network/usb_network.sh b/meta-google/recipes-google/networking/google-usb-network/usb_network.sh
index aa384ad..0483e08 100755
--- a/meta-google/recipes-google/networking/google-usb-network/usb_network.sh
+++ b/meta-google/recipes-google/networking/google-usb-network/usb_network.sh
@@ -97,6 +97,7 @@
         ip link set dev "$ifname" down || true
         ip link set dev "$ifname" name "${IFACE_NAME}" || return
     fi
+    ip link set dev "$IFACE_NAME" up || return
 }
 
 gadget_stop() {