PCI: Disable MSI for Tegra234 Root Ports

Tegra234 PCIe Root Ports don't generate MSI interrupts for PME and AER
events. Since PCIe spec (r6.0 sec 6.1.4.3) doesn't support using a mix of
INTx and MSI/MSI-X, MSI needs to be disabled to avoid Root Port service
drivers registering their respective ISRs with MSI interrupt and to let
only INTx be used for all events.

Link: https://lore.kernel.org/r/20220721142052.25971-8-vidyas@nvidia.com


Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>