The add_pcie_port() function is dra7xx-specific.  Add dra7xx prefix to
avoid collision in global name space.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NKishon Vijay Abraham I <kishon@ti.com>