ACPICA: Return object repair: Add string-to-unicode conversion

Used for the _STR and _MLS predefined names.  Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acnamesp.h

@@ -181,6 +181,10 @@ acpi_status
 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
 			  union acpi_operand_object **return_object);
 
+acpi_status
+acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
+			   union acpi_operand_object **return_object);
+
 /*
  * nsdump - Namespace dump/print utilities
  */