Revert "Remove legacy reading of PS derating"
Revert "Remove legacy reading of PS derating"

This reverts commit 1bf3b749e9217f03fbc55bbb45802df9e715e3b0.

Change-Id: Ib364199f4d676c2003450cad4b4d3d6077356fc1
Signed-off-by: Dhruvaraj Subhashchandran <19c03e3300faf6397505c2237d88ece502fa4419@in.ibm.com>

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