Add Chassis POH Counter

Added 32-bit counter, which shows how many hours the system has been
running. The value is a cumulative one and includes all working hours
since production. If the chassis state is Powered-on, This will be
incremented by one for every hour. It won't get updated when the
chassis state is powered-off.

Resolves openbmc/openbmc#2979

Change-Id: I18e9bb571d1a6e401b25450168249f70891be665
Signed-off-by: Nagaraju Goruganti <ngorugan@in.ibm.com>
5 files changed