ARM: dts: bcm2711: Add HDMI DVP

Now that we have a driver for the DVP, let's add its DT node.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/e22222ca7f41b960e9bb1a31e0dd2de95b8c0cd1.1591867332.git-series.maxime@cerno.tech