Change POINTER_ICON_STYLE enum to a type safe enum class

Test: Current tests all pass, this is a static type change, not
a functional change.

Change-Id: I8f0e8e43ea64f5abab163e4ef5444a8cb3d4fa78

libs/input/PointerController.cpp

@@ -264,7 +264,7 @@ void PointerController::setDisplayViewport(const DisplayViewport& viewport) {
     }
 }
 
-void PointerController::updatePointerIcon(int32_t iconId) {
+void PointerController::updatePointerIcon(PointerIconStyle iconId) {
     std::scoped_lock lock(getLock());
     mCursorController.updatePointerIcon(iconId);
 }