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/SpriteController.cpp b/libs/input/SpriteController.cpp
index a5ca498..cab3f84 100644
--- a/libs/input/SpriteController.cpp
+++ b/libs/input/SpriteController.cpp
@@ -242,7 +242,7 @@
                     && (becomingVisible
                             || (update.state.dirty & (DIRTY_HOTSPOT | DIRTY_ICON_STYLE)))) {
                 Parcel p;
-                p.writeInt32(update.state.icon.style);
+                p.writeInt32(static_cast<int32_t>(update.state.icon.style));
                 p.writeFloat(update.state.icon.hotSpotX);
                 p.writeFloat(update.state.icon.hotSpotY);