host-error-monitor: Disable tests

As of the most recent host-error-monitor SRCREV bump to commit
7aede384fc, builds may fail if the googletest package isn't found:

```
../git/tests/meson.build:15:8: ERROR: Assert failed: Googletest is required if tests are enabled
```

Let's return them to being disabled by default for yocto builds.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I48246f69cd76d8e7cdd89c63db56f3e9e6876027
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 e730f6b..c412d39 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
@@ -7,6 +7,8 @@
 PACKAGECONFIG[crashdump] = "-Dcrashdump=enabled,-Dcrashdump=disabled"
 PACKAGECONFIG[send-to-logger] = "-Dsend-to-logger=enabled,-Dsend-to-logger=disabled"
 
+EXTRA_OEMESON += "-Dtests=disabled"
+
 SRC_URI = "git://github.com/openbmc/host-error-monitor;branch=master;protocol=https"
 
 DEPENDS = "boost sdbusplus libgpiod libpeci phosphor-dbus-interfaces"