IPMI - get device ID

[Dave Cobbley]

I noticed a bit of the get-device-id information in 
phosphor-ipmi-host/apphandler is hard coded.

Much of this info should be determined at compile time - would the 
inventory manager be the appropriate place that all platforms under the 
OpenBMC umbrella would like to store this information?

•   Device ID
•   Device Revision
•   IANA
•   Product ID
•   Auxiliary

Thanks,

-Dave Cobbley