PCI: dwc: Rename 'dw_pcie::link_gen' to 'dw_pcie::max_link_speed'

The 'link_gen' field is now holding the maximum supported link speed set
either by the controller driver or by DT through 'max-link-speed'
property.

However, the name 'link_gen' sounds like the negotiated link speed of
the PCIe link.

So rename it to 'max_link_speed' to make it clear that it holds the
maximum supported link speed of the controller.

Link: https://lore.kernel.org/linux-pci/[email protected]
Tested-by: Johan Hovold <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Frank Li <[email protected]>
Reviewed-by: Johan Hovold <[email protected]>

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