Remove including certificate manager instance for nginx in image

nginx is no longer supported, removing phosphor-certificate-manager
instance for nginx from image.

(From meta-ibm rev: 6430a4cd66fde71f0f6dc7068fc80a4e9c4bc989)

Change-Id: Iedd34d672b61c867b695fab2d8b5f1af55013610
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/recipes-phosphor/image/obmc-phosphor-image.bbappend b/meta-ibm/recipes-phosphor/image/obmc-phosphor-image.bbappend
index d1fe57f..bda681e 100644
--- a/meta-ibm/recipes-phosphor/image/obmc-phosphor-image.bbappend
+++ b/meta-ibm/recipes-phosphor/image/obmc-phosphor-image.bbappend
@@ -1,5 +1,4 @@
 OBMC_IMAGE_EXTRA_INSTALL_append = "\
-    phosphor-nginx-cert-config \
     phosphor-nslcd-cert-config \
     phosphor-nslcd-authority-cert-config \
     "