MdeModulePkg: Make HII configuration settings available to OS runtime

This feature is aimed to allow OS make use of the HII database
during runtime. In this case, the contents of the HII Database
is exported to a buffer. The pointer to the buffer is placed
in the EFI System Configuration Table, where it can be retrieved
by an OS application.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Brian J. Johnson <bjohnson@sgi.com>
Cc: Andrew Fish <afish@apple.com>
Cc: El-Haj-Mahmoud Samer <samer.el-haj-mahmoud@hpe.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

MdeModulePkg/Universal/HiiDatabaseDxe/HiiDatabaseDxe.inf

@@ -4,7 +4,7 @@
 # This driver produces all required HII serivces that includes HiiDataBase, HiiString,
 # HiiFont, HiiConfigRouting. To support UEFI HII, this driver is required.
 #
-# Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
 #
 #  This program and the accompanying materials       
 #  are licensed and made available under the terms and conditions of the BSD License   
@@ -72,6 +72,7 @@
 
 [FeaturePcd]
   gEfiMdeModulePkgTokenSpaceGuid.PcdSupportHiiImageProtocol   ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport       ## CONSUMES
 
 [Pcd]
   gEfiMdePkgTokenSpaceGuid.PcdUefiVariableDefaultPlatformLang ## CONSUMES