ACPICA: Add Windows8/Server2012 string for _OSI method.

This change adds a new _OSI string, "Windows 2012" for both Windows 8
and Windows Server 2012.

From Microsoft document "How to Identify the Windows Version in ACPI
by Using _OSI", July 13, 2012.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index cc80fe1..493529a 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -932,6 +932,7 @@
 #define ACPI_OSI_WIN_VISTA_SP1          0x09
 #define ACPI_OSI_WIN_VISTA_SP2          0x0A
 #define ACPI_OSI_WIN_7                  0x0B
+#define ACPI_OSI_WIN_8                  0x0C
 
 #define ACPI_ALWAYS_ILLEGAL             0x00