libqos: pci-pc: use 32-bit write for EJ register

The memory region ops have min_access_size == 4 so obey it.
Tested-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

tests/qtest/libqos/pci-pc.c

@@ -186,7 +186,7 @@ void qpci_unplug_acpi_device_test(QTestState *qts, const char *id, uint8_t slot)
     g_assert(!qdict_haskey(response, "error"));
     qobject_unref(response);
 
-    qtest_outb(qts, ACPI_PCIHP_ADDR + PCI_EJ_BASE, 1 << slot);
+    qtest_outl(qts, ACPI_PCIHP_ADDR + PCI_EJ_BASE, 1 << slot);
 
     qtest_qmp_eventwait(qts, "DEVICE_DELETED");
 }