PCI: imx6: Report "link up" only after link training completes

While waiting for the PHY to report the PCIe link is up, we might hit a
situation where the link training is still in progress, while the PHY
already reports the link is up.  Add additional check for this condition.

Signed-off-by: Marek Vasut <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Cc: Frank Li <[email protected]>
Cc: Harro Haan <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: Mohit KUMAR <[email protected]>
Cc: Pratyush Anand <[email protected]>
Cc: Richard Zhu <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Sean Cross <[email protected]>
Cc: Siva Reddy Kallam <[email protected]>
Cc: Srikanth T Shivanand <[email protected]>
Cc: Tim Harvey <[email protected]>
Cc: Troy Kisky <[email protected]>
Cc: Yinghai Lu <[email protected]>

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