ARM: dts: am335x: Fix TDA998x ports addressing

Fix addressing in the NXP TDA998x HDMI transmitters' subnodes:
  - Add missing #{address,size}-cells properties to ports capsule,
  - Add missing reg properties to port child nodes,
  - Drop bogus unit addresses from endpoint grandchildren nodes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Message-Id: <e9ac64d29bc18b3b394fd9a2abbfeafacc624f98.1669047037.git.geert+renesas@glider.be>
Signed-off-by: Tony Lindgren <tony@atomide.com>