Revert "Revert "Switch ril and telephony projects to caf branch""

This reverts commit 67c1cdb347af6b96b38d7d0141822f6246fb2444.
Revert "Revert "switch system/core to caf branch""

This reverts commit 8bf1d9f62381dca1d110adbe790eb7afdfa9d19d.