xps13: Sporadic PCIe4 uncorrectable error on boot

Only seen it once so far:

[   31.762796] pcieport 0004:00:00.0: PCIe Bus Error: severity=Uncorrectable (Fatal), type=Transaction Layer, (Receiver ID)
[   31.762799] pcieport 0004:00:00.0:   device [17cb:0111] error status/mask=00000020/00400000
[   31.762801] pcieport 0004:00:00.0:    [ 5] SDES                   (First)

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