ARM: dts: rockchip: Add HDMI audio support to rk3288-veyron-mickey

Add HDMI audio support to veyron-mickey. The sound card should expose
one audio device for HDMI.

Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Link: https://lore.kernel.org/r/20191028071930.145899-7-cychiang@chromium.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>