Merge change 24941 into donut

* changes:
  Add TTS files and Accessibility app to the SDK system image.
tree: 3a3d56028af18fa27b4e35140a050764e11a4600
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh