PCI: designware: Make driver arch-agnostic

Previously, dw_pcie_host_init() created the PCI host bridge with
pci_common_init_dev(), an ARM-specific function that supplies the ARM-
specific pci_sys_data structure as the PCI "sysdata".

Make pcie-designware.c arch-agnostic by reimplementing the functionality of
pci_common_init_dev() directly in dw_pcie_host_init().

Note that this changes the bridge sysdata from the ARM pci_sys_data to the
DesignWare pcie_port structure.  This doesn't affect the ARM sysdata users
because they are all specific to non-DesignWare host bridges, which will
still have pci_sys_data.

[bhelgaas: changelog]
Tested-by: James Morse <[email protected]>
Tested-by: Gabriel Fernandez <[email protected]>
Tested-by: Minghuan Lian <[email protected]>
Signed-off-by: Zhou Wang <[email protected]>
Signed-off-by: Gabriele Paoloni <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Pratyush Anand <[email protected]>

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