Power: Add dbus error for voltage regulator fault

Add dbus error for voltage regulator fault.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I9a94670e5bcc3d4bdb044532e84fb70da5bf041c
diff --git a/yaml/xyz/openbmc_project/State/Shutdown/Power.errors.yaml b/yaml/xyz/openbmc_project/State/Shutdown/Power.errors.yaml
index 2786ae3..59df1cd 100644
--- a/yaml/xyz/openbmc_project/State/Shutdown/Power.errors.yaml
+++ b/yaml/xyz/openbmc_project/State/Shutdown/Power.errors.yaml
@@ -3,3 +3,6 @@
 
 - name: Blackout
   description: The system suffered a power blackout.
+
+- name: Regulator
+  description: A voltage regulator fault was detected.