meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-extended/rsyslog/rsyslog_%.bbappend b/meta-phosphor/recipes-extended/rsyslog/rsyslog_%.bbappend
index 0a2fb33..f04f63d 100644
--- a/meta-phosphor/recipes-extended/rsyslog/rsyslog_%.bbappend
+++ b/meta-phosphor/recipes-extended/rsyslog/rsyslog_%.bbappend
@@ -1,4 +1,4 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 
 SRC_URI += " \
     file://rsyslog.conf \
@@ -10,7 +10,7 @@
     ${@bb.utils.filter('DISTRO_FEATURES', 'systemd', d)} \
 "
 
-do_install_append(){
+do_install:append(){
     install -m 0644 -D ${WORKDIR}/server.conf \
         ${D}${sysconfdir}/rsyslog.d/server.conf
 }