ncsid: Use per-interface gateway

Change-Id: I97185fc181918ad4668cb4e758eec25c51090b04
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/ncsid/src/update_ra_gw.sh b/subprojects/ncsid/src/update_ra_gw.sh
index 47e7f27..77d77f4 100644
--- a/subprojects/ncsid/src/update_ra_gw.sh
+++ b/subprojects/ncsid/src/update_ra_gw.sh
@@ -28,7 +28,7 @@
   (( lifetime > 0 )) || return
 
   echo "Setting default router: $rtr at $mac" >&2
-  UpdateGateway xyz.openbmc_project.Network "$rtr" || return
+  UpdateGateway xyz.openbmc_project.Network "$NCSI_IF" "$rtr" || return
   UpdateNeighbor xyz.openbmc_project.Network "$NCSI_IF" "$rtr" "$mac" || return
 
   retries=-1