Remove including certificate manager instance for nginx in image

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

Change-Id: Ic10668e7cb9c5af7fbdd71aafbcb4f7d885d771b
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
diff --git a/recipes-phosphor/image/obmc-phosphor-image.bbappend b/recipes-phosphor/image/obmc-phosphor-image.bbappend
index d1fe57f..bda681e 100644
--- a/recipes-phosphor/image/obmc-phosphor-image.bbappend
+++ b/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 \
     "