dsdt: tweak ACPI ID for hotplug resource device

ACPI0004 seems too new:
Windows XP complains about an unrecognized device.
This is a regression since 1.7.
Use PNP0A06 instead - Generic Container Device.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-By: NIgor Mammedov <imammedo@redhat.com>

hw/i386/acpi-dsdt-cpu-hotplug.dsl

@@ -93,7 +93,7 @@ Scope(\_SB) {
     }
 
     Device(CPU_HOTPLUG_RESOURCE_DEVICE) {
-        Name(_HID, "ACPI0004")
+        Name(_HID, EisaId("PNP0A06"))
 
         Name(_CRS, ResourceTemplate() {
             IO(Decode16, CPU_STATUS_BASE, CPU_STATUS_BASE, 0, CPU_STATUS_LEN)