CryptoPkg/BaseCrpytLib: Retire MD4 algorithm

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1898

MD4 is not secure any longer.
Remove the MD4 support from edk2.
Change the MD4 field name in EDKII_CRYPTO_PROTOCOL to indicate the
function is unsupported any longer.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>

CryptoPkg/Library/BaseCryptLib/RuntimeCryptLib.inf

@@ -6,12 +6,12 @@
 #  This external input must be validated carefully to avoid security issues such as
 #  buffer overflow or integer overflow.
 #
-#  Note: MD4 Digest functions, SHA-384 Digest functions, SHA-512 Digest functions,
+#  Note: SHA-384 Digest functions, SHA-512 Digest functions,
 #  HMAC-MD5 functions, HMAC-SHA1/SHA256 functions, AES/TDES/ARC4 functions, RSA external
 #  functions, PKCS#7 SignedData sign functions, Diffie-Hellman functions, and
 #  authenticode signature verification functions are not supported in this instance.
 #
-#  Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -35,7 +35,6 @@
 
 [Sources]
   InternalCryptLib.h
-  Hash/CryptMd4Null.c
   Hash/CryptMd5.c
   Hash/CryptSha1.c
   Hash/CryptSha256.c