when we disable lcd for impl reasons, add kGenA8 to document the original intent

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 62d60da178bd790582acdf5aba3c7db92791e0bb..6beb26e4cad9c42d70b99e44f7d62f867a15e222 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1993,7 +1993,6 @@ public:
         if (device->filterTextFlags(paint, &flags)) {
             SkPaint* newPaint = fLazy.set(paint);
             newPaint->setFlags(flags.fFlags);
-            newPaint->setHinting(flags.fHinting);
             fPaint = newPaint;
         } else {
             fPaint = &paint;