This gets the playback ui exactly like the redlines.

- Various fixes to make voicemail playback ui just like the redlines.
- Swap speakerphone and playback buttons over.
- Vastly expanded seekbar area, as well as bigger touch targets for rate
  buttons.
- Rate buttons and seekbar now correctly vertically aligned with one
  another.
- Adds the second blue separator line after the contact picture.
- Makes the thumb seek drawable always centred on the seek bar current
  position, including making it overhang the seek bar by half its width
  at each extreme end (looks much better).

Bug: 5070975
Change-Id: I530fd5bccab688f20f9f6b3c3919da3a475c8ba5