pc: disable pci-info

The BIOS that we ship in 1.7 does not use pci info
from host and so far isn't going to use it.
Taking in account problems it caused see 9604f70 and
to avoid future incompatibility issues, it's safest to
disable that interface by default for all machine types
including 1.7 as it was never exposed/used by guest.
And properly remove/cleanup it during 1.8 development cycle.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/i386/pc_piix.c

@@ -58,7 +58,7 @@ static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
 static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
 
 static bool has_pvpanic;
-static bool has_pci_info = true;
+static bool has_pci_info;
 static bool has_acpi_build = true;
 
 /* PC hardware initialisation */

hw/i386/pc_q35.c

@@ -48,7 +48,7 @@
 #define MAX_SATA_PORTS     6
 
 static bool has_pvpanic;
-static bool has_pci_info = true;
+static bool has_pci_info;
 static bool has_acpi_build = true;
 
 /* PC hardware initialisation */