CryptoPkg: Add Null functions for building pass

Add Null functions to build. These feature are not supported now.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4177

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Yi Li <yi1.li@intel.com>
Cc: Xiaoyu Lu <xiaoyu1.lu@intel.com>
Cc: Guomin Jiang <guomin.jiang@intel.com>
Signed-off-by: Wenxing Hou <wenxing.hou@intel.com>
Reviewed-by: Yi Li <yi1.li@intel.com>

CryptoPkg/Library/BaseCryptLibMbedTls/Pem/CryptPemNull.c

@@ -0,0 +1,69 @@
+/** @file
+  PEM (Privacy Enhanced Mail) Format Handler Wrapper Implementation which does
+  not provide real capabilities.
+
+Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "InternalCryptLib.h"
+
+/**
+  Retrieve the RSA Private Key from the password-protected PEM key data.
+
+  Return FALSE to indicate this interface is not supported.
+
+  @param[in]  PemData      Pointer to the PEM-encoded key data to be retrieved.
+  @param[in]  PemSize      Size of the PEM key data in bytes.
+  @param[in]  Password     NULL-terminated passphrase used for encrypted PEM key data.
+  @param[out] RsaContext   Pointer to new-generated RSA context which contain the retrieved
+                           RSA private key component. Use RsaFree() function to free the
+                           resource.
+
+  @retval FALSE  This interface is not supported.
+
+**/
+BOOLEAN
+EFIAPI
+RsaGetPrivateKeyFromPem (
+  IN   CONST UINT8  *PemData,
+  IN   UINTN        PemSize,
+  IN   CONST CHAR8  *Password,
+  OUT  VOID         **RsaContext
+  )
+{
+  ASSERT (FALSE);
+  return FALSE;
+}
+
+/**
+  Retrieve the EC Private Key from the password-protected PEM key data.
+
+  Return FALSE to indicate this interface is not supported.
+
+  @param[in]  PemData      Pointer to the PEM-encoded key data to be retrieved.
+  @param[in]  PemSize      Size of the PEM key data in bytes.
+  @param[in]  Password     NULL-terminated passphrase used for encrypted PEM key data.
+  @param[out] EcContext    Pointer to new-generated EC context which contain the retrieved
+                           EC private key component. Use EcFree() function to free the
+                           resource.
+
+  If PemData is NULL, then return FALSE.
+  If EcContext is NULL, then return FALSE.
+
+  @retval FALSE  This interface is not supported.
+
+**/
+BOOLEAN
+EFIAPI
+EcGetPrivateKeyFromPem (
+  IN   CONST UINT8  *PemData,
+  IN   UINTN        PemSize,
+  IN   CONST CHAR8  *Password,
+  OUT  VOID         **EcContext
+  )
+{
+  ASSERT (FALSE);
+  return FALSE;
+}