Move isSkiaEnabled to the Properties class

Move CanvasContext::isSkiaEnabled to Properties:isSkiaEnabled.

Change-Id: I0a62f43825cf59ba338a24a056e8c2a56d1c5315
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index 5d892fd..133ae80 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -253,7 +253,7 @@
 enum class RenderPipelineType {
     OpenGL = 0,
     SkiaGL,
-    Vulkan,
+    SkiaVulkan,
     NotInitialized = 128
 };