void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
			  size_t align, enum pci_epc_interface_type type)
void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
			  const struct pci_epc_features *epc_features,
			  enum pci_epc_interface_type type)