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/telemetry/telemetry_git.bb b/meta-phosphor/recipes-phosphor/telemetry/telemetry_git.bb
index 0499052..c68faa4 100644
--- a/meta-phosphor/recipes-phosphor/telemetry/telemetry_git.bb
+++ b/meta-phosphor/recipes-phosphor/telemetry/telemetry_git.bb
@@ -22,6 +22,6 @@
            sdbusplus \
            systemd"
 
-SYSTEMD_SERVICE_${PN} = "xyz.openbmc_project.Telemetry.service"
+SYSTEMD_SERVICE:${PN} = "xyz.openbmc_project.Telemetry.service"
 EXTRA_OEMESON = "-Dbuildtest=false"