ACPICA: Tables: Merge DMAR table structure updates

This patch is a back port result of the following Linux commit:
  Author: David Woodhouse <David.Woodhouse@intel.com>
  Subject: iommu/vt-d: Add ACPI namespace device reporting structures

ACPICA need to handle old compilers where u8 object_name[] is only allowed
for an initialized variable. This patch reduces back port source code
differences between Linux and ACPICA upstream.

Cc: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: NLv Zheng <lv.zheng@intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

include/acpi/actbl2.h

@@ -516,7 +516,7 @@ struct acpi_dmar_andd {
 	struct acpi_dmar_header header;
 	u8 reserved[3];
 	u8 device_number;
-	u8 object_name[];
+	char object_name[1];
 };
 
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