meta-gsj: phosphor-pid-control: Change fan read path

This commit changes fan read path so as not to trigger fan-fail utility
in phosphor-pid-control but dual-rotor-fail service.

Signed-off-by: Hank Liou <Hank.Liou@quantatw.com>
Change-Id: I5810f1471f572557d3ee1f3bbd7e71ca6b451654
2 files changed