host-error-monitor: inherit pkgconfig

We need pkgconfig to get the systemd service file location variable to
support usrmerge.

Tested:
Confirmed that host-error-monitor can find pkgconfig and the systemd
service file location variable.

Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Change-Id: Id453f64d7b249c4fcb0af4cc8395dea8dc3c5f96
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 00b5cf3..2eb7ca0 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
@@ -1,6 +1,6 @@
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=7becf906c8f8d03c237bad13bc3dac53"
-inherit cmake systemd
+inherit cmake pkgconfig systemd
 
 SRC_URI = "git://github.com/openbmc/host-error-monitor;branch=master;protocol=https"