Adding FEEDBACK_BRAILLE to AccessibilityServiceInfo.

1. The feedback type provided by braille devices differs from all
   already predefined types and this change defines braille
   feedback type. Braille does not fit in the already predefined
   categories.

bug:6998945

Change-Id: Ide6043bed03fdecd6d2ee45a08762f5bd07a2118
2 files changed