Port of a Linux commit feb85d9

  Split pcie-designware.c into pcie-designware-host.c that contains the host
  specific parts of the driver and pcie-designware.c that contains the parts
  used by both host driver and endpoint driver.

  Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
  Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>