stepwisecontroller: add stepwise info setter

Add a setter for the stepwise info.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Idf15ed3820291d5e7b5c4caea8afaf146d4b5ce9
diff --git a/pid/stepwisecontroller.cpp b/pid/stepwisecontroller.cpp
index b6703ba..c8ec219 100644
--- a/pid/stepwisecontroller.cpp
+++ b/pid/stepwisecontroller.cpp
@@ -78,10 +78,7 @@
     }
 
     auto thermal = std::make_unique<StepwiseController>(id, inputs, owner);
-
-    ec::StepwiseInfo& info = thermal->getStepwiseInfo();
-
-    info = initial;
+    thermal->setStepwiseInfo(initial);
 
     return thermal;
 }