callouts: add example output YAML
callouts: add example output YAML

YAML is of the form:
<sysfs device path>: <inventory path to be called out>

This will help generate code to map device paths to inventory objects.

Change-Id: I5613e766d0c6b39d9b2c4a6146a747ab321555cb
Signed-off-by: Deepak Kodihalli <54105a30055f1e07853b8ee7a2f0d75d22ed98c1@in.ibm.com>

openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging