Merge branch 'pci/endpoint/epf-vntb'

- Return -ENOENT (not -1) if pci_epc_get_next_free_bar() fails (Jerome
  Brunet)

- Align MW (memory window) naming with config names (Jerome Brunet)

- Allow BAR assignment via configfs so platforms have flexibility in
  determining BAR usage (Jerome Brunet)

- Drop incorrect '__iomem' annotation on the return value of
  pci_epf_alloc_space(); this also fixes an sparse warning (Manivannan
  Sadhasivam)

* pci/endpoint/epf-vntb:
  PCI: endpoint: pci-epf-vntb: Fix the incorrect usage of __iomem attribute
  PCI: endpoint: pci-epf-vntb: Allow BAR assignment via configfs
  PCI: endpoint: pci-epf-vntb: Align MW naming with config names
  PCI: endpoint: pci-epf-vntb: Return -ENOENT if pci_epc_get_next_free_bar() fails