ARM: dts: renesas: Remove unused remote property from adv7180 nodes

The remote property is never read by the driver, remove it.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20200704155856.3037010-3-niklas.soderlund+renesas@ragnatech.se


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>