**Is your feature request related to a problem? Please describe.** <!-- This request is about the Xilinx PCIe IP support in Zephyr. Arm developed a FPGA board MPS4, it integrates PCI Express v4.1 as PCIe controller. <img width="689" height="629" alt="Image" src="https://github.com/user-attachments/assets/31317cd4-05ca-4503-9e0f-151734b6eb66" /> The Linux source code has supported it well, however, we still haven't seen any code in Zephyr supporting it. Looking forward your feedback! Thanks. -->
Is your feature request related to a problem? Please describe.