meta-intel-openbmc: prep for new override syntax

Ran `scripts/contrib/convert-overrides.py` from upstream Yocto and
fixed up a few by hand that were missed.

Tested: Built s2600wf.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Change-Id: I983385c8cdd4e2727c5c1a3d56952d6ac7fd89cc
diff --git a/meta-intel-openbmc/meta-common/recipes-core/host-error-monitor/host-error-monitor_git.bb b/meta-intel-openbmc/meta-common/recipes-core/host-error-monitor/host-error-monitor_git.bb
index 1236cbf..7d30a7d 100644
--- a/meta-intel-openbmc/meta-common/recipes-core/host-error-monitor/host-error-monitor_git.bb
+++ b/meta-intel-openbmc/meta-common/recipes-core/host-error-monitor/host-error-monitor_git.bb
@@ -11,6 +11,6 @@
 
 S = "${WORKDIR}/git"
 
-SYSTEMD_SERVICE_${PN} += "xyz.openbmc_project.HostErrorMonitor.service"
+SYSTEMD_SERVICE:${PN} += "xyz.openbmc_project.HostErrorMonitor.service"
 
 EXTRA_OECMAKE = "-DYOCTO=1"