PCI/ACPI: Use METHOD_NAME__UID instead of plain string

Replace the string "_UID" with the METHOD_NAME__UID macro so instances are
easier to find.

Link: https://lore.kernel.org/r/20221104032430.186424-1-zouyipeng@huawei.comSigned-off-by: NYipeng Zou <zouyipeng@huawei.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci-acpi.c

@@ -67,7 +67,7 @@ static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
 	unsigned long long uid;
 	acpi_status status;
 
-	status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
+	status = acpi_evaluate_integer(handle, METHOD_NAME__UID, NULL, &uid);
 	if (ACPI_FAILURE(status) || uid != *segment)
 		return AE_CTRL_DEPTH;