New Spam-related options in call log entries.

This includes small UI additions to the call log UI; Mainly,
two new buttons to mark each phone number entry as a Spam number
or remove the phone number from the spam list. This also includes
a service definition that will be needed to render the buttons or
keep them hidden.

Change-Id: I7cf22f6027728ebc0dfe9e3b5b923ee70bcaadd2