Add FaultLog DumpEntry interface to FaultLog object

Type property can used to identify CPER / Crashdump log.
PrimaryLogId can used to identify the path for log file.

$> busctl introspect xyz.openbmc_project.Dump.Manager \
        /xyz/openbmc_project/dump/faultlog/entry/1

xyz.openbmc_project.Dump.Entry.FaultLog interface -
.AdditionalTypeName                     property  s
.PrimaryLogId                           property  s
.Type                                   property  s

Signed-off-by: John Chung <john.chung@arm.com>
Change-Id: I9a2a089bedc120da4cde8521f032fea92a84de10