dt-bindings: misc: introduce pci1179,0220.yaml

Define the binding for the Toshiba TC9564 PCI endpoint function device.
The third downstream PCIe switch port within this chip has an embedded
PCIe controller, and that implements two of these PCIe functions.

Multiple internal components are accessed via PCI function BARs, as
indicated in the diagram below.  This is facilitated by the use of the
devicetree pci-ep-bus mechanism, and is demonstrated in the example.

Co-developed-by: Daniel Thompson <daniel@riscstar.com>
Signed-off-by: Daniel Thompson <daniel@riscstar.com>
Signed-off-by: Alex Elder <elder@riscstar.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260918152659.413268-2-elder@riscstar.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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