pcie: validate QPS615 runtime topology

[Srikanth Muppandam (smuppand)]

Summary

Extend PCIe and Ethernet inventory validation with capability-driven QPS615 topology, firmware, endpoint binding, and network-interface checks.

Depends on the platform runtime foundation PR and should remain Draft until that PR merges.

Changes

• Add generic PCIe runtime health collection for link state, driver binding, MSI, capabilities, and runtime power.
• Dynamically discover QPS615 bridge functions and downstream PCI devices.
• Validate the QPS615 PCIe bridge firmware artifact.
• Discover QPS615 Ethernet endpoints from runtime PCI topology.
• Validate actual endpoint driver binding and associated network interfaces.
• Report driver registration, module availability, modalias, module parameters, and unbound endpoint state.
• Share QPS615 inventory logic between the PCIe and Ethernet suites through lib_ethernet.sh.
• Retain structured topology artifacts for debugging.
• Preserve existing generic PCIe and Ethernet validation when QPS615 is absent.

Result classification

• QPS615 switch absent: QPS615-specific validation is not applicable, generic validation continues.
• Switch, downstream topology, and firmware healthy: topology check passes.
• Declared Ethernet endpoint unbound or missing its runtime network interface: fails with endpoint-specific evidence.
• Optional or unused downstream bridge ports do not cause false failures.