Misc tweaks to Safety settings UI

- Remove emergency info setting tile from Safety setting page. The
  emergency info setting is now injected as emergency contact & medical
  info settings.

- Add an icon to emergency gesture setting
- Add an icon place holder to WEA setting

Bug: 184261824
Test: manual
Change-Id: I8bb9abfac054b5745e978695043584ea1266d53e