PCI: xgene: Revert "PCI: xgene: Fix IB window setup"

PCI: xgene: Revert "PCI: xgene: Fix IB window setup"

commit ef41e631a838905b9329f2b296818d4e6802f9c3 upstream.

Commit 410a70bd33b7 ("PCI: xgene: Fix IB window setup") tried to
fix the damages that 1c8e2e09cbdf ("PCI: xgene: Use inbound resources
for setup") caused, but actually didn't improve anything for some
plarforms (at least Mustang and m400 are still broken).

Given that 1c8e2e09cbdf has been reverted, revert this patch as well,
restoring the PCIe support on XGene to its pre-5.5, working state.

Link: https://lore.kernel.org/r/YjN8pT5e6/8cRohQ@xps13.dannf
Link: https://lore.kernel.org/r/20220321104843.949645-3-maz@kernel.org
Fixes: 410a70bd33b7 ("PCI: xgene: Fix IB window setup")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: Toan Le <toan@os.amperecomputing.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Krzysztof Wilczyński <kw@linux.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Stéphane Graber <stgraber@ubuntu.com>
Cc: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>