virpcimock: Don't create "pci-stub" driver

Now that nothing supports "pci-stub" driver (aka KVM style of PCI
device assignment) there is no need for virpcimock to create it.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Tested-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

tests/virpcimock.c

@@ -992,7 +992,6 @@ init_env(void)
 
     MAKE_PCI_DRIVER("iwlwifi", 0x8086, 0x0044);
     MAKE_PCI_DRIVER("i915", 0x8086, 0x0046, 0x8086, 0x0047);
-    MAKE_PCI_DRIVER("pci-stub", -1, -1);
     pci_driver_new("vfio-pci", PCI_ACTION_BIND, -1, -1);
 
 # define MAKE_PCI_DEVICE(Id, Vendor, Device, ...) \