arm64: dts: renesas: Add initial SoC DTSI for RZ/V2H(P) SoC

arm64: dts: renesas: Add initial SoC DTSI for RZ/V2H(P) SoC

Add initial SoC DTSI for Renesas RZ/V2H(P) ("R9A09G057") SoC, below are
the list of blocks added:
- EXT CLKs
- 4X CA55
- SCIF
- PFC
- CPG
- SYS
- 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/20240828124134.188864-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>