meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-support/rng-tools/rng-tools_%.bbappend b/meta-phosphor/recipes-support/rng-tools/rng-tools_%.bbappend
index e9577eb..98e8130 100644
--- a/meta-phosphor/recipes-support/rng-tools/rng-tools_%.bbappend
+++ b/meta-phosphor/recipes-support/rng-tools/rng-tools_%.bbappend
@@ -1,16 +1,16 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 SRC_URI += "file://10-nice.conf"
 
-PACKAGECONFIG_remove = "\
+PACKAGECONFIG:remove = "\
         ${@bb.utils.contains('MACHINE_FEATURES', 'hw-rng', \
                              'libjitterentropy', '', d)}\
         "
 
 inherit systemd
 
-FILES_${PN} += "${systemd_system_unitdir}/rngd.service.d"
+FILES:${PN} += "${systemd_system_unitdir}/rngd.service.d"
 
-do_install_append() {
+do_install:append() {
 
     # When using systemd and using libjitterentropy, install a config
     # which runs rngd at a 'nice' priority.  libjitterentropy uses a