Revise Call Settings in Telephony.

- Deleting settings/strings which have been moved to Dialer.
+ Delete DefaultRingtonePreference (moved to Dialer).
+ Move some methods into PhoneCommon, where they can be common utils.
+ Move SIP settings off the main call settings page into a
preference screen.

Bug: 16788935
Change-Id: Ic9171d5d06d98a8556cdb38477668d8e7e2d07f6
6 files changed