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/bios/biosconfig-manager_git.bb b/meta-phosphor/recipes-phosphor/bios/biosconfig-manager_git.bb
index 2fa80e4..60d0f9d 100644
--- a/meta-phosphor/recipes-phosphor/bios/biosconfig-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/bios/biosconfig-manager_git.bb
@@ -18,7 +18,7 @@
 inherit meson pkgconfig systemd
 
 S = "${WORKDIR}/git"
-SYSTEMD_SERVICE_${PN} = "xyz.openbmc_project.biosconfig_manager.service \
+SYSTEMD_SERVICE:${PN} = "xyz.openbmc_project.biosconfig_manager.service \
                          xyz.openbmc_project.biosconfig_password.service"
 
 DEPENDS = " boost \