Fix Sensor query for derating factor returns 0
Fix Sensor query for derating factor returns 0

The issue here is that for derating factor sensor read command,
hostboot is expecting return value in event_status field, but we are
sending it in sensor reading field.

Testing:
ipmitool raw 0x04 0x2d 0xd8 #it has to retrun "00 00 5a 00"
Resolves openbmc/openbmc#3012

Change-Id: I09e3d02c946ad1d8a39ea747fc400fb623cbe6ef
Signed-off-by: Nagaraju Goruganti <1d37a7c32d654f6415246cddf510d3f39482ea59@in.ibm.com>

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid