dt-bindings: PCI: renesas,r9a08g045-pcie: Add RZ/V2H(P) support

Add support for the PCIe controller found on the Renesas RZ/V2H(P) SoC.

The RZ/V2H(P) controller is similar to the RZ/G3E variant but includes
additional registers and configuration bits for PCIe lane control. It
supports multilink operation configured as either a single x4 link
or two independent x2 link controllers.

Unlike earlier SoCs supported by this driver which only feature a single
PCIe controller, the RZ/V2H(P) SoC implements two controllers. Both
instances rely on the system controller (SYSC) for configuration, but
the required registers reside at different offsets for each controller.

To correctly identify the controller instance and map the corresponding
system controller registers, update the "renesas,sysc" property to a
phandle-array. For the RZ/V2H(P) SoC, require an accompanying cell to
specify the controller instance index (0 or 1). For all earlier SoCs,
strictly restrict the property to a single phandle with zero argument
cells.

Additionally, make the "num-lanes" property mandatory for this SoC and
restrict its values according to the hardware capabilities.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20260629220932.861445-2-prabhakar.mahadev-lad.rj@bp.renesas.com

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