x86: quark: acpi: Replace _ADR() by _UID() in description of PCI host bridge

PCI Firmware specification requires _UID() and doesn't require _ADR()
to be set. Replace latter by former. This fixes the following warning
reported by ACPICA 20200430:

  Warning 3073 - Multiple types (Device object requires either a _HID
  or _ADR, but not both)

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/arch/x86/include/asm/arch-quark/acpi/southcluster.asl b/arch/x86/include/asm/arch-quark/acpi/southcluster.asl
index fe9edc1..384dab2 100644
--- a/arch/x86/include/asm/arch-quark/acpi/southcluster.asl
+++ b/arch/x86/include/asm/arch-quark/acpi/southcluster.asl
@@ -8,7 +8,7 @@
 	Name(_HID, EISAID("PNP0A08"))	/* PCIe */
 	Name(_CID, EISAID("PNP0A03"))	/* PCI */
 
-	Name(_ADR, 0)
+	Name(_UID, 0)
 	Name(_BBN, 0)
 
 	Name(MCRS, ResourceTemplate()