acpi: drop build_piix4_pm()

The _SB.PCI0.PX13.P13C opregion (holds isa device enable bits)
is not used any more, remove it from DSDT.

piix4 DSDT changes:

     Scope (_SB.PCI0)
     {
-        Device (PX13)
-        {
-            Name (_ADR, 0x00010003)  // _ADR: Address
-            OperationRegion (P13C, PCI_Config, Zero, 0xFF)
-        }
-    }
-
-    Scope (_SB.PCI0)
-    {
         Device (ISA)
         {
             Name (_ADR, 0x00010000)  // _ADR: Address
             OperationRegion (P40C, PCI_Config, 0x60, 0x04)
         }
     }
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NIgor Mammedow <imammedo@redhat.com>
Message-Id: <20200619091905.21676-11-kraxel@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/i386/acpi-build.c

@@ -1364,21 +1364,6 @@ static void build_q35_isa_bridge(Aml *table)
     aml_append(table, scope);
 }
 
-static void build_piix4_pm(Aml *table)
-{
-    Aml *dev;
-    Aml *scope;
-
-    scope =  aml_scope("_SB.PCI0");
-    dev = aml_device("PX13");
-    aml_append(dev, aml_name_decl("_ADR", aml_int(0x00010003)));
-
-    aml_append(dev, aml_operation_region("P13C", AML_PCI_CONFIG,
-                                         aml_int(0x00), 0xff));
-    aml_append(scope, dev);
-    aml_append(table, scope);
-}
-
 static void build_piix4_isa_bridge(Aml *table)
 {
     Aml *dev;
@@ -1530,7 +1515,6 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         aml_append(dsdt, sb_scope);
 
         build_hpet_aml(dsdt);
-        build_piix4_pm(dsdt);
         build_piix4_isa_bridge(dsdt);
         build_isa_devices_aml(dsdt);
         build_piix4_pci_hotplug(dsdt);