cfm: allow setting of max pwm

When a change from xyz.openbmc_project.Control.CFMLimit
interface is detected set the max pwm in pid control configs
to limit max fan speed.

This also puts the max CFM on d-bus for other commands to
use.

Tested-by: Used settingsd to control fan speed

Change-Id: Ic4ca37747690f6476cfa12bf3c19a44d7ee086c8
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/service_files/xyz.openbmc_project.exitairsensor.service b/service_files/xyz.openbmc_project.exitairsensor.service
index ca7dbb0..8049445 100644
--- a/service_files/xyz.openbmc_project.exitairsensor.service
+++ b/service_files/xyz.openbmc_project.exitairsensor.service
@@ -1,6 +1,7 @@
 [Unit]
 Description=Exit Air Temp Sensor
 StopWhenUnneeded=false
+After=xyz.openbmc_project.Settings.service
 
 [Service]
 Restart=always