PCI: mvebu: Add a blank line after declarations

This patch fixes the following checkpatch warning:

  WARNING: Missing a blank line after declarations

[bhelgaas: drop mvebu_pcie_add_bus() change because it's going away anyway]
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>