pci: brcmstb: rework iBAR handling

Rework the setup of inbound PCIe windows: use the convenience functions
from Linux kernel commit ae6476c6de187 to calculate the BAR offsets and
factor out the setup code into a separate function.

The Linux kernel first allocates and populates an array of inbound_win[]
and sets the BARs from it later, while U-Boot does it all on the fly,
in one go, so the code is not 1:1 comparable.

Signed-off-by: Torsten Duwe <[email protected]>
Tested-by: Pedro Falcato <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>

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