meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-phosphor/host/phosphor-host-postd_git.bb b/meta-phosphor/recipes-phosphor/host/phosphor-host-postd_git.bb
index 77d36bb..7ff4b2c 100644
--- a/meta-phosphor/recipes-phosphor/host/phosphor-host-postd_git.bb
+++ b/meta-phosphor/recipes-phosphor/host/phosphor-host-postd_git.bb
@@ -27,7 +27,7 @@
 
 SERVICE_FILE = "lpcsnoop.service"
 SYSTEMD_PACKAGES = "${PN}"
-SYSTEMD_SERVICE_${PN} += "${SERVICE_FILE}"
+SYSTEMD_SERVICE:${PN} += "${SERVICE_FILE}"
 
 EXTRA_OEMESON += "-Dsnoop-device=${SNOOP_DEVICE}"
 EXTRA_OEMESON += "-Dpost-code-bytes=${POST_CODE_BYTES}"
@@ -38,4 +38,4 @@
   postcode-7seg@.service \
   postcode-7seg@${POSTCODE_SEVENSEG_DEVICE}.service \
 "
-SYSTEMD_SERVICE_${PN} += "${@bb.utils.contains('PACKAGECONFIG', '7seg', '${SERVICE_FILE_7SEG}', '', d)}"
+SYSTEMD_SERVICE:${PN} += "${@bb.utils.contains('PACKAGECONFIG', '7seg', '${SERVICE_FILE_7SEG}', '', d)}"