systemd: BMC error for multi-user.target fails

This error will logged when the multi-user.target has an error status
upon completion

Change-Id: Iab9317921549320bfe0fea4a3dc3646d09930ef9
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/xyz/openbmc_project/State/BMC.errors.yaml b/xyz/openbmc_project/State/BMC.errors.yaml
new file mode 100644
index 0000000..10a1dfe
--- /dev/null
+++ b/xyz/openbmc_project/State/BMC.errors.yaml
@@ -0,0 +1,3 @@
+# xyz.openbmc_project.State.BMC.Error.MultiUserTargetFailure
+- name: MultiUserTargetFailure
+  description: The systemd multi-user.target failed to complete