Update Telephony Event Names for Consistency

-Events all prefixed with "Event"
-All constants in snake-case all-caps

-Partial fix for b/26471724

Bug: 26471724

Change-Id: I4d33f2f0d48982497c31317af7e0f07f960fc84f
3 files changed
tree: 2dce9a0d9d7eb8854b6f642e4d1cffb33d4964cd
  1. sl4a/
  2. sl4n/