Use fontation SkTypeface backend

By default, the FreeType implementation is still used.
Following command changes text library from FreeType to Fontation.

```adb shell setprop debug.hwui.text.backend 2```

Bug: 405267306
Test: atest CtsWidgetTestCases CtsTextTestCases CtsGraphicsTestCases
Flag: com.android.text.flags.use_fontation_by_default
Change-Id: I955c0147de3226cec233b5b441f06f222776b64c