arm64: dts: renesas: Add initial SoC DTSI for RZ/V2N

arm64: dts: renesas: Add initial SoC DTSI for RZ/V2N

Add the initial Device Tree Source Include (DTSI) file for the Renesas
RZ/V2N (R9A09G056) SoC. Include support for the following components:
  - CPU (Cortex-A55 cores with operating points)
  - External clocks (audio, qextal, rtxin)
  - Pin controller (GPIO support)
  - Clock Pulse Generator (CPG)
  - System controller (SYS)
  - Serial Communication Interface (SCIF)
  - Secure Digital Host Interface (SDHI 0/1/2)
  - Generic Interrupt Controller (GIC)
  - ARMv8 timer

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250407191628.323613-12-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>