meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb b/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb
index 6716d9a..6cc4fd8 100644
--- a/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb
+++ b/meta-phosphor/recipes-x86/peci-pcie/peci-pcie_git.bb
@@ -15,6 +15,6 @@
 
 S = "${WORKDIR}/git"
 
-SYSTEMD_SERVICE_${PN} += "xyz.openbmc_project.PCIe.service"
+SYSTEMD_SERVICE:${PN} += "xyz.openbmc_project.PCIe.service"
 
 EXTRA_OECMAKE = "-DYOCTO=1"