Implement filtering of call log.

This commit adds a menu options to filter the call log to show only
voicemails.

Currently the list is reset whenever the user switching to a different
tab or activity, in fact any time the content of the call log needs to
is refreshed.

Bug: 5035665
Change-Id: I7e412b02e08f8d7a15abc2ea1897b726f30bf1de
4 files changed