am bbed0d68: hide setGammaForText, which is only used for calibrating new devices

Merge commit 'bbed0d68c815446400193bdc8b16fbf73e1ee664' into eclair-plus-aosp

* commit 'bbed0d68c815446400193bdc8b16fbf73e1ee664':
  hide setGammaForText, which is only used for calibrating new devices