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 <[email protected]>
Change-Id: I48246f69cd76d8e7cdd89c63db56f3e9e6876027

Author: zevweiss

Diff for: meta-intel-openbmc/meta-common/recipes-core/host-error-monitor/host-error-monitor_git.bb

@@ -7,6 +7,8 @@ PACKAGECONFIG[libpeci] = "-Dlibpeci=enabled,-Dlibpeci=disabled"
 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"