wspoon: Enable fan control to run at BMC standby

To allow thermal modes to be selected at BMC standby, the fan control
application must be running. The phosphor-fan-control@.service file is
needed to start fan control at BMC standby and the
phosphor-fan-control-init@.service is no longer required.

Tested:
    Witherspoon phosphor-fan-control@.service replaced in image
    phosphor-fan-control-init@.service removed from image
    fan watchdog configs appended to fan control service still
    phosphor-fan-control@.service started at BMC standby
    fan control thermal modes presented/changeable at BMC standby
    no function change in configured thermal modes

Change-Id: I463cce182a838e634a789bcdfada7ddc05e341a1
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
4 files changed