tests/libqos: rename qpci_init_pc and qpci_init_spapr functions

tests/libqos: rename qpci_init_pc and qpci_init_spapr functions

Rename qpci_init_pc in qpci_pc_new and qpci_init_spapr in qpci_spapr_new,
since these function actually allocate a new pci struct and initialize it
(compare to object_new and object_initialize).
Changed QOSOps field name from qpci_init to qpci_new.

Signed-off-by: Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>