dt-bindings: PCI: dwc: Update maxItems of reg and reg-names

Update maxItems of reg and reg-names on both host and endpoint
for supporting Renesas R-Car Gen4 PCIe controllers later.

Link: https://lore.kernel.org/linux-pci/20231018085631.1121289-10-yoshihiro.shimoda.uh@renesas.com


Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>