tree 137db460c1d23e7a620a78b8a8cf8dd86891eeb8
parent 1738e2a2b705f64e0c823b095b504dfe397a87ab
author James Feist <james.feist@linux.intel.com> 1548978742 -0800
committer James Feist <james.feist@linux.intel.com> 1549395005 -0800

Add Hysteresis to pid controllers

Add hysteresis to pid controllers to lower pwm changes.
It is defaulted to 0 so it should be transparent
to any controller that choses not to implement it.
This is the same pattern used by the stepwise controller.

Tested-by: Unit tests passed

Change-Id: Ib47114285b0017258b7f77eaf067d310f95a0c60
Signed-off-by: James Feist <james.feist@linux.intel.com>