1. change the text size of header title
2. Set gravity of header title as "center"
Bug: 138633953
Test: manually
Change-Id: I358c6a10e3cb97b46c3b8f6d50f7046414ddfb13
If device supports metadata, then we display advanced UI in Bluetooth
details header. This CL adds layout for this header.
In advanced layout, it will show:
1. Device name
2. Left, right and case icon
3. Left, right and case battery level
Once API is ready, following CL will get metadata from it and set it
to UI.
Bug: 122460277
Test: RunSettingsRoboTests
Change-Id: Ide044cf9705f350b431b2cb3a9ad82cc4425a17e