reset PMBA and PMREGMISC PIIX4 registers.

The bug causes Windows + OVMF hang after reboot since OVMF
checks PMREGMISC to see if IO space is enabled and skip
configuration if it is.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/acpi_piix4.c

@@ -352,6 +352,9 @@ static void piix4_reset(void *opaque)
     pci_conf[0x5a] = 0;
     pci_conf[0x5b] = 0;
 
+    pci_conf[0x40] = 0x01; /* PM io base read only bit */
+    pci_conf[0x80] = 0;
+
     if (s->kvm_enabled) {
         /* Mark SMM as already inited (until KVM supports SMM). */
         pci_conf[0x5B] = 0x02;
@@ -391,8 +394,6 @@ static int piix4_pm_initfn(PCIDevice *dev)
     pci_conf[0x09] = 0x00;
     pci_conf[0x3d] = 0x01; // interrupt pin 1
 
-    pci_conf[0x40] = 0x01; /* PM io base read only bit */
-
     /* APM */
     apm_init(&s->apm, apm_ctrl_changed, s);