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
diff --git a/libs/input/PointerController.h b/libs/input/PointerController.h
index eab030f..33480e8 100644
--- a/libs/input/PointerController.h
+++ b/libs/input/PointerController.h
@@ -65,7 +65,7 @@
                           BitSet32 spotIdBits, int32_t displayId);
     virtual void clearSpots();
 
-    void updatePointerIcon(int32_t iconId);
+    void updatePointerIcon(PointerIconStyle iconId);
     void setCustomPointerIcon(const SpriteIcon& icon);
     void setInactivityTimeout(InactivityTimeout inactivityTimeout);
     void doInactivityTimeout();