PCI: xilinx: Rename xilinx_pcie_port to xilinx_pcie

Rename struct xilinx_pcie_port to xilinx_pcie to match the convention of
<driver>_pcie. No functional change intended.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Fan Fei <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Michal Simek <[email protected]>

Author: firebolt007