PCI: dwc: Centralize link gen setting

keystone would force gen2 if no DT property. Now it relies on the
PCI_EXP_LNKCAP value.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Richard Zhu <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Pengutronix Kernel Team <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: NXP Linux Team <[email protected]>
Cc: Murali Karicheri <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: Gustavo Pimentel <[email protected]>
Cc: Stanimir Varbanov <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Pratyush Anand <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Jonathan Hunter <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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