Use single layout for both 1- and 2-line device item UI.

As a side effect, this change also fixes vertical alignment for the
2-line layout. Per spec, the text should be centered vertically
https://docs.google.com/presentation/d/1KeK-ROye8eCrst2bFi4c5o_jgm7q-ikUQMFUJAMsC10/edit#slide=id.gfb77bb45a4_0_322, and not aligned to the top.

Flag: EXEMPT refactor, bugfix
Bug: 387570618
Test: atest SystemUIGoogleRoboRNGTests:MediaOutputAdapterScreenshotTest,
    atest SystemUiRoboTests:MediaOutputAdapterTest,
    Tested Talkback behavior on the local device.
Change-Id: I74d88ff6330fa47dcd0614db60f7a573d18d0112