bcm64: fix usb xhci controller on pi4 8GB variant (thanks richard miller)

On the 8GB variant of the raspberry pi 4,
the eeprom chip for the xhci controller is missing and
instead loaded from sdram (by the gpu firmware).

for this, the gpu firmware needs to be notified of
the xhci controllers pci bus address (after reset)
that was assigned by our pci enumeration code.

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