Dialer: Replace pngs with xml drawables [2/x]

* Many already even have a proper replacement in the sources,
  we just need to make use of them!
* Find proper replacements from MDI for those where we don't
  have them already
* Remove others that are completely unused

Change-Id: Iecfbc9c99bc6da9adf453f0b4d485a3cebc6da1e