framework: Add equalizer tile

Shows the current visualizer of current
audio output of device.

Should not show up for remote-playing device, such
as Chromecasts.

Clicking the tile opens the current EQ app.

Change-Id: Id7d073699764eacbe1d769a18c249eb80feb2a88
Signed-off-by: Roman Birg <roman@cyngn.com>