dt-bindings: PCI: brcm,stb-pcie: Add 7712 SoC description

Add description for the 7712 SoC, a Broadcom STB sibling chip
of the Raspberry Pi 5.

The 7712 uses three reset controllers: rescal, for PHY reset
calibration; bridge, for the bridge between the PCIe bus and
the memory bus; and swinit, which is a "soft" initialization
of the PCIe HW.

Link: https://lore.kernel.org/linux-pci/[email protected]
Signed-off-by: Jim Quinlan <[email protected]>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>

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