Bjorn Helgaas 545d7b78e0 PCI: Use PCI_EXP_SLTCAP_PSN mask when extracting slot number
Use PCI_EXP_SLTCAP_PSN mask to make it easier to find where the
Physical Slot Number is used.

The Physical Slot Number is bits 31:19 of the Slot Capabilities Register,
and slot_cap is a u32, so the mask is technically unnecessary, but it's
helpful for human readers.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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