ARM/PCI: Call pcie_bus_configure_settings() to set MPS

ARM/PCI: Call pcie_bus_configure_settings() to set MPS

Call pcie_bus_configure_settings() on ARM, like for other platforms.
pcie_bus_configure_settings() makes sure the MPS across the bus is uniform
and provides the ability to tune the MRSS and MPS to higher performance
values.  This is particularly important for embedded where there is no
firmware to program these PCIe settings for the OS.

vidyas: make similar change for ARM64
based on upstream commit 8b5742ad156d30ee38486652cdbd152e2d6ebbcc

Bug 1496843

Change-Id: Ib42fa0480bd93b99c708bbad655b60d6e684077b
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Reviewed-on: http://git-master/r/454899
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>