Spelling corrections and other minor cosmetic cleanups.

- Fixed a bunch of typos in comments (plus a few variable names)
- Removed unused import lines from telephony classes
- Added @Override attribute to overriding methods
- Made SmsMessage.PduParser inner class private & deleted unused constructor
- Added type specifiers to declarations of ArrayList and HashMap
- SimulatedCommands.getRegistrationState() had an ArrayIndexOutOfBoundsException
  trying to write to index 14 of a 14-element array. I removed the
  out-of-bounds assignment.

Change-Id: I054b5156aa64ab6639028d5b45a7e688b2deee08