arm/acpi: fix duplicated _UID of PCI interrupt link devices

Using _UID of 0 for all PCI interrupt link devices absolutely violates
the spec. Simply increase one by one.

Signed-off-by: Heyi Guo <guoheyi@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200204014325.16279-6-guoheyi@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt-acpi-build.c

@@ -189,7 +189,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
         uint32_t irqs =  irq + i;
         Aml *dev_gsi = aml_device("GSI%d", i);
         aml_append(dev_gsi, aml_name_decl("_HID", aml_string("PNP0C0F")));
-        aml_append(dev_gsi, aml_name_decl("_UID", aml_int(0)));
+        aml_append(dev_gsi, aml_name_decl("_UID", aml_int(i)));
         crs = aml_resource_template();
         aml_append(crs,
                    aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,