Make VelocityControl::getParameters() const.

Bug: None
Test: Presubmit
Change-Id: Ie9951171ef42f7b3fc0eb3349c605d7f850082e2
diff --git a/libs/input/VelocityControl.cpp b/libs/input/VelocityControl.cpp
index 5c008b1..0b5f8e5 100644
--- a/libs/input/VelocityControl.cpp
+++ b/libs/input/VelocityControl.cpp
@@ -37,7 +37,7 @@
     reset();
 }
 
-VelocityControlParameters& VelocityControl::getParameters() {
+const VelocityControlParameters& VelocityControl::getParameters() const{
     return mParameters;
 }