Update analyze to check VIN_UV_FAULT

The function is a pure virtual function in DeviceMonitor, add in the
implementation of that for PowerSupply. Read the file that represents
that bit from the STATUS_WORD. If fault is on, report a fault.

Change-Id: I05a4bff997bb0c8b8b71db444e9db0e506765689
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/xyz/openbmc_project/Power/Fault.metadata.yaml b/xyz/openbmc_project/Power/Fault.metadata.yaml
index b9e41f6..0274523 100644
--- a/xyz/openbmc_project/Power/Fault.metadata.yaml
+++ b/xyz/openbmc_project/Power/Fault.metadata.yaml
@@ -1,3 +1,5 @@
+- name: PowerSupplyUnderVoltageFault
+  level: ERR
 - name: Shutdown
   level: ERR