Implement Get POH Counter command

It returns a counter value proportional to the system operating
power-on hours.

Partially Resolves openbmc/openbmc#2979

Change-Id: Ib0cd43fe5cbc055ae84991577d766bedae58d775
Signed-off-by: Nagaraju Goruganti <ngorugan@in.ibm.com>
diff --git a/host-ipmid-whitelist.conf b/host-ipmid-whitelist.conf
index 0111b9b..a95e99e 100644
--- a/host-ipmid-whitelist.conf
+++ b/host-ipmid-whitelist.conf
@@ -4,6 +4,7 @@
 0x00:0x02    //<Chassis>:<Chassis Control>
 0x00:0x08    //<Chassis>:<Set System Boot Options>
 0x00:0x09    //<Chassis>:<Get System Boot Options>
+0x00:0x0F    //<Chassis>:<Get POH Counter Command>
 0x04:0x2D    //<Sensor/Event>:<Get Sensor Reading>
 0x04:0x2F    //<Sensor/Event>:<Get Sensor Type>
 0x04:0x30    //<Sensor/Event>:<Set Sensor Reading and Event Status>