Basically set text size to 18sp and change layouts
along with the new design.
- Add custom list item xml for Wi-Fi security field
rename existing "custom_list_item.xml" to appropriate
name so that we won't be confused with their naming.
- Use the custom xml just in SetupWizard.
Bug: 3364731
Change-Id: I014903277a03c359ea193dd0f0a37c84ade19fa1
7893447987