Merge branch 'pci/enumeration'

- Allow 'isolated PCI functions' (multi-function devices without a function
  0) for LoongArch, similar to s390 and jailhouse (Huacai Chen)

- Mask out unrelated bits in PCIE_LNKCAP_SLS2SPEED() and
  PCIE_LNKCTL2_TLS2SPEED(), which makes them more robust and fixes a
  WARN_ON_ONCE() in pcie_set_target_speed() (Jiwei Sun)

- Read Link Control 2 again when retraining a link after a training failure
  so we try to increase the link speed (Jiwei Sun)

- Allow built-in drivers, not just modular drivers, to use async initial
  probing (Lukas Wunner)

- Support Immediate Readiness even on devices with no PM Capability (Sean
  Christopherson)

* pci/enumeration:
  PCI: Support Immediate Readiness on devices without PM capabilities
  PCI: Allow built-in drivers to use async initial probing
  PCI: Adjust the position of reading the Link Control 2 register
  PCI: Fix link speed calculation on retrain failure
  PCI: Extend isolated function probing to LoongArch