Add feature Cold Redundancy

Add an Intel specific feature PSU Cold Redundancy. This is the first patch
which will get PSU information and PSU Event from D-Bus interfaces.
Cold Redund

Add feature Cold Redundancy

Add an Intel specific feature PSU Cold Redundancy. This is the first patch
which will get PSU information and PSU Event from D-Bus interfaces.
Cold Redundancy design document is in
https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/27637

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: Ic039118e4cebc8b0ff6ba80493180a1d8af0096b

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