arm64: dts: renesas: Use interrupts-extended for DisplayPort bridges

Use the more concise interrupts-extended property to fully describe the
interrupts.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/2b217486221d90eb3c127f5e44f9c886161ab8c6.1728045620.git.geert+renesas@glider.be