Reorganize folders in omtp visual voicemail to make more sense.

* Moved classes relating to fetching to
  "com.android.phone.vvm.omtp.fetch"
* Moved classes relating to syncing to "com.android.phone.vvm.omtp.sync"
* Fix references

Bug: 19236241
Change-Id: I25d79a66d9caaf373b8fd80b39ccdabc7565de5e
7 files changed