dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3E SoC

dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3E SoC

Extend the existing device tree bindings for Renesas RZ/G3S PCIe
controller to include support for the RZ/G3E (renesas,r9a09g047e57-pcie)
PCIe controller. The RZ/G3E PCIe controller is similar to RZ/G3S but has
some key differences:

 - Uses a different device ID
 - Supports PCIe Gen3 (8.0 GT/s) link speeds
 - Uses a different clock naming (clkpmu vs clkl1pm)
 - Has a different set of interrupts, interrupt ordering, and reset
   signals

Add device tree bindings for renesas,r9a09g047e57-pcie compatible IPs.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # RZ/V2N EVK
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20260306143423.19562-7-john.madieu.xa@bp.renesas.com