pci: Add AMD Versal2 DW PCIe host controller driver

Add support for the DesignWare-based PCIe host controller found in
AMD Versal2 SoCs. This enables PCIe functionality (e.g. NVMe storage)
on boards such as the VEK385.

The driver builds on the existing pcie_dw_common infrastructure and
adds Versal2-specific handling: it maps the SLCR register region to
mask and clear TLP interrupt status bits, parses dbi/config/atu/slcr
register regions from device tree, and supports an optional PERST#
GPIO on child nodes for endpoint reset sequencing. The outbound iATU
is programmed for the non-prefetchable memory window from device tree
ranges.

Signed-off-by: Pranav Sanwal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

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