CryptoPkg: Add HMAC-SHA256 cipher support

Add new HMAC-SHA256 cipher support in CryptoPkg to meet more security
and industry requirements,

and update Cryptest utility to include new HMAC-SHA256 test case.

Cc: Ting Ye <ting.ye@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Ting Ye <ting.ye@intel.com>

CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf

@@ -6,7 +6,7 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 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
@@ -41,6 +41,7 @@
   Hash/CryptSha512.c
   Hmac/CryptHmacMd5.c
   Hmac/CryptHmacSha1.c
+  Hmac/CryptHmacSha256.c
   Cipher/CryptAes.c
   Cipher/CryptTdes.c
   Cipher/CryptArc4.c