Add Power Fault shutdown error

This error will be used on Witherspoon when the power
sequencer chip detects a power fault, which requires
a power off to be done.

Change-Id: Ia5f99c67c4e9436ca86f9d94d08644fcac012824
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/xyz/openbmc_project/State/Shutdown/Power.errors.yaml b/xyz/openbmc_project/State/Shutdown/Power.errors.yaml
new file mode 100644
index 0000000..b364c2d
--- /dev/null
+++ b/xyz/openbmc_project/State/Shutdown/Power.errors.yaml
@@ -0,0 +1,2 @@
+- name: Fault
+  description: The system was shut down because a power fault was detected.