SecurityPkg: Update PlatformSecureLibNull with PCD to get physical presence.

This is an incompatible change. It uses PcdUserPhysicalPresence value instead
of hard code TRUE. Because PcdUserPhysicalPresence default value is FALSE,
this patch changes UserPhysicalPresent() return value from TRUE to FALSE.

From Security point, it is not safe to always return TRUE. If user wants this
behavior, he can still configure PcdUserPhysicalPresence value to TRUE in
the platform DSC file.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>

SecurityPkg/Library/PlatformSecureLibNull/PlatformSecureLibNull.inf

@@ -6,7 +6,7 @@
 #  related features during platform enabling and development. It should be replaced
 #  by a platform-specific method(e.g. Button pressed) in a real platform for product.
 #
-# Copyright (c) 2011 - 2014, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2011 - 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
 # which accompanies this distribution. The full text of the license may be found at
@@ -24,7 +24,7 @@
   MODULE_TYPE                    = DXE_DRIVER
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = PlatformSecureLib|DXE_RUNTIME_DRIVER DXE_SMM_DRIVER DXE_DRIVER
-
+  CONSTRUCTOR                    = PlatformSecureLibNullConstructor
 
 #
 # The following information is for reference only and not required by the build tools.
@@ -37,3 +37,8 @@
 
 [Packages]
   MdePkg/MdePkg.dec
+  SecurityPkg/SecurityPkg.dec
+
+[Pcd]
+  gEfiSecurityPkgTokenSpaceGuid.PcdUserPhysicalPresence    ## CONSUMES
+