meta-google: obmc-phosphor-image: Add NCSI when specified

Change-Id: Id15f7bb08f08da3cfdef24c0c38a42caffdb70c0
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
index 917a03c..37655b9 100644
--- a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -6,3 +6,5 @@
 
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = " gbmc-systemd-config"
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = " gbmc-iperf3"
+OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = \
+  '${@"" if not d.getVar("GBMC_NCSI_IF_NAME") else " gbmc-ncsi-config"}'