Improve multi user functionality for restricted users

- Restricted users can change their name
- Improved App&Content access screen
- Remove "Turn on phone calls" from restricted user detail page

Doc: http://shortn/_Prb3SJ3xJ3
Bug: 142798722
Test: Run robo tests with this command:
  make -j64 RunSettingsRoboTests
Change-Id: I2aadf32aef52ba5ad0db7aa0cd83bac9d9941589