Move PointerController enums to enum classes.

Bug: 160010896
Test: atest PointerController_test, compile
Change-Id: Ie5ba68a5082fff6ccc85ab01ff49344b73d0bb1b
diff --git a/services/inputflinger/reader/InputReader.cpp b/services/inputflinger/reader/InputReader.cpp
index d3441ac..06e3743 100644
--- a/services/inputflinger/reader/InputReader.cpp
+++ b/services/inputflinger/reader/InputReader.cpp
@@ -427,7 +427,7 @@
 void InputReader::fadePointerLocked() {
     std::shared_ptr<PointerControllerInterface> controller = mPointerController.lock();
     if (controller != nullptr) {
-        controller->fade(PointerControllerInterface::TRANSITION_GRADUAL);
+        controller->fade(PointerControllerInterface::Transition::GRADUAL);
     }
 }