SecurityPkg: Add RNG support

Uses the RDRAND instruction if available and install EfiRngProtocol.
The protocol may be used by iPXE or the Linux kernel to gather entropy.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Guo Dong <guo.dong@intel.com>
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Change-Id: I0f74b64c6a7e8fc6fdd8ea8f2a416d8b7c0334f4

SecurityPkg/Library/BaseRngLib/BaseRngLib.uni

@@ -0,0 +1,17 @@
+// /** @file
+// Instance of RNG (Random Number Generator) Library.
+//
+// BaseRng Library that uses CPU RdRand instruction access to provide
+// high-quality random numbers.
+//
+// Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Instance of RNG Library"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "BaseRng Library that uses CPU RdRand instruction access to provide high-quality random numbers"
+