Revert "Add code to handle voice radio technology of LTE."

This reverts commit b54cd098.

PhoneProxy.java should not be reverted because we want phoneObjectUpdater() to always be called from the handler function. That is done in commit I2fc7220496e66fc2a48f2609e94cbd8eed6adc44

Change-Id: I83b4ffe40a30207ca01d4268de2fc1cde8fff602