meta-ethanolx: Fix CPU fan names in IPMI YAML file

The BMC on the AMD Ethanol CRB uses entity-manager for sensor
configuration. Therefore IPMI configuration YAML file should
use DBus paths to sensors based on the names from the entity-manager
JSON files.
Currently 'ethanolx-chassis.json' exports CPU fans on a DBus as
"P0_Fan"/"P1_Fan". Use these names to correctly populate CPU fans
to the IPMI.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: I0425e42771e1bfb36ad067dfcad5a23e5f180d67