Update power supply inventory path
Update power supply inventory path

https://gerrit.openbmc-project.xyz/#/c/8936/ is changing
the power supply inventory path.  See that commit
for the reasoning.

Change-Id: I351bb7300590c2fd260fb6838785e40a729226a0
Signed-off-by: Matt Spinler <c000c989d08c98662d98f15448f11de169feb92d@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation