Clean up and rename TypefaceImpl

bug:25865834
Change-Id: I77e8a627163e040a5c25865054a8a936052af367
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 26b4c4e..516591b 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -16,7 +16,7 @@
     hwui/MinikinSkia.cpp \
     hwui/MinikinUtils.cpp \
     hwui/PaintImpl.cpp \
-    hwui/TypefaceImpl.cpp \
+    hwui/Typeface.cpp \
     renderstate/Blend.cpp \
     renderstate/MeshState.cpp \
     renderstate/OffscreenBufferPool.cpp \