qdpc-host: re-enable PCIe MPS fix.

On gftv254, the MPS control register must be read and written, in either
order, even though the actual value is never changed. Restore the call
to qdpc_tune_pcie_mps() until a permanent solution is found.

Change-Id: I6637e73371e68f3965bc7c1dcd626038795ee668
3 files changed