dt-bindings: PCI: Add UltraRISC DP1000 PCIe controller

dt-bindings: PCI: Add UltraRISC DP1000 PCIe controller

Add UltraRISC DP1000 SoC PCIe controller devicetree bindings.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: squash MAINTAINERS to driver commit update to touch only once]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260427-ultrarisc-pcie-v4-2-98935f6cdfb5@ultrarisc.com