PEL: API for getting if system is HMC managed
PEL: API for getting if system is HMC managed

Add an API to the DataInterface class for determining if
the system is HMC (hardware management console, which usually
reference to a specific set of software and hardware that
connects to IBM servers) managed.

As of now there is no way to determine this, so just return
the default of false.

This status impacts which PELs are sent to the host.

Signed-off-by: Matt Spinler <c000c989d08c98662d98f15448f11de169feb92d@us.ibm.com>
Change-Id: I803bc71c271dec6d68821dd36089e7a46461aac6

openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging