Add the chain of display nodes from the core display-subsystem
through the one vop to the dw-hdmi output.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>

changes in v3:
- drop reg from hdmi-in-port
changes in v2:
- remove trailing 0 from vop irq