ibm: phosphor-image: minor style fix

Wrap lines at 80 characters.

Change-Id: I8f526de878251b28c06b0d3c9b5cde6b2106c5bd
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/image/obmc-phosphor-image.bbappend b/recipes-phosphor/image/obmc-phosphor-image.bbappend
index 7beefd6..fd9e3cf 100644
--- a/recipes-phosphor/image/obmc-phosphor-image.bbappend
+++ b/recipes-phosphor/image/obmc-phosphor-image.bbappend
@@ -1 +1,4 @@
-OBMC_IMAGE_EXTRA_INSTALL_append = " phosphor-nginx-cert-config phosphor-nslcd-cert-config"
+OBMC_IMAGE_EXTRA_INSTALL_append = "\
+    phosphor-nginx-cert-config \
+    phosphor-nslcd-cert-config \
+    "