arm64: dts: allwinner: pinetab: Add HDMI support

This patch enables HDMI display on PINE64 PineTab.

The PineTab has a HDMI Type C (mini) port.

Signed-off-by: Dang Huynh <danct12@disroot.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210914193732.3047668-1-danct12@disroot.org