Add clear faults support

Add support to send the clear-logged-faults command to
the UCD90160 chip.  This is a manufacturer specific command.
The PMBus standard clear-faults command is done automatically
by the device driver every time a PMBus sysfs file is read.

Change-Id: I6a9f670502ce1e1b4ffbaab63db335daa0865f46
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/power-sequencer/ucd90160.cpp b/power-sequencer/ucd90160.cpp
index 739cff2..7a69a64 100644
--- a/power-sequencer/ucd90160.cpp
+++ b/power-sequencer/ucd90160.cpp
@@ -30,6 +30,8 @@
 
 using namespace std::string_literals;
 
+const auto CLEAR_LOGGED_FAULTS = "clear_logged_faults"s;
+
 const auto DEVICE_NAME = "UCD90160"s;
 const auto DRIVER_NAME = "ucd9000"s;
 
@@ -94,7 +96,19 @@
 
 void UCD90160::clearFaults()
 {
-
+    try
+    {
+        interface.write(CLEAR_LOGGED_FAULTS, 1, Type::Base);
+    }
+    catch (WriteFailure& e)
+    {
+        if (!accessError)
+        {
+            log<level::ERR>("UCD90160 clear logged faults command failed");
+            commit<WriteFailure>();
+            accessError = true;
+        }
+    }
 }
 
 bool UCD90160::checkVOUTFaults()