PCI: dwc: all: Use platform_set_drvdata() to save private data

Add platform_set_drvdata() in all designware-based drivers to store the
private data structure of the driver so that dev_set_drvdata() can be used
to get back private data structure in add_pcie_port/host_init.  This is in
preparation for splitting struct pcie_port into core and host only
structures. After the split pcie_port will not be part of the driver's
private data structure and *container_of* used now to get the private data
pointer cannot be used.

Signed-off-by: Kishon Vijay Abraham I <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
CC: Jingoo Han <[email protected]>
CC: Richard Zhu <[email protected]>
CC: Lucas Stach <[email protected]>
CC: Murali Karicheri <[email protected]>
CC: Minghuan Lian <[email protected]>
CC: Mingkai Hu <[email protected]>
CC: Roy Zang <[email protected]>
CC: Thomas Petazzoni <[email protected]>
CC: Niklas Cassel <[email protected]>
CC: Jesper Nilsson <[email protected]>
CC: Joao Pinto <[email protected]>
CC: Zhou Wang <[email protected]>
CC: Gabriele Paoloni <[email protected]>
CC: Stanimir Varbanov <[email protected]>
CC: Pratyush Anand <[email protected]>

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