In cherry projects, we use edptx as the internal display interface
and use dptx as the external display interface. To support this, we
need to add more properties.
- Add pinctrls for edptx and dptx.
- Add ports for edptx and dptx.
The port connections for the internal and external display:
dp-intf0 -> edptx -> panel
dp-intf1 -> dptx
Because it lacks port of panel, so we keep empty remote-endpoint for
port1@edptx.
Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>