lspci: Decode PCIe Link Capabilities 2, expand Link Status 2

Decode Link Capabilities 2, which includes the Supported Link Speeds
Vector, and decode more fields of Link Status 2.

The test case (dat

lspci: Decode PCIe Link Capabilities 2, expand Link Status 2

Decode Link Capabilities 2, which includes the Supported Link Speeds
Vector, and decode more fields of Link Status 2.

The test case (data from https://bugzilla.kernel.org/show_bug.cgi?id=206837
comment #21) includes a Thunderbolt Downstream Port that advertises
2.5-8GT/s support in Link Capabilities 2.

Signed-off-by: Bjorn Helgaas <[email protected]>

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