Vertically center elements within output switcher chip

Bug: 159990829
Test: manual - Change text size to smallest and look at output switcher
ship. Verify that text is aligned to center of device icon.
Test: manual - Change text size to largest and look at output switcher
chip. Verify that icon is aligned to center of device name text.

Change-Id: Ie1303c003afce190013aa78295e9d2b8425301f9