By default we do not speak passwords if the user has no headset. However,
many users find this too restrictive and would like a way to enable
password announcement. While we cannot speak the passwords all the time
,to avoid leaking them, we expose a preference so each user can choose
the option that best works for him/her.
bug:5712607
Change-Id: I6eb0c40834abe5297f7dc74be02d180a5bef0174
55f937abe1