SecurityPkg: Add gmock example

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4389

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Chris Johnson <chris.n.johnson@intel.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Oliver Smith-Denny <osde@linux.microsoft.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

SecurityPkg/Test/Mock/Include/GoogleTest/Library/MockPlatformPKProtectionLib.h

@@ -0,0 +1,28 @@
+/** @file
+  Google Test mocks for PlatformPKProtectionLib
+
+  Copyright (c) 2022, Intel Corporation. All rights reserved.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef MOCK_PLATFORM_PK_PROTECTION_LIB_H_
+#define MOCK_PLATFORM_PK_PROTECTION_LIB_H_
+
+#include <Library/GoogleTestLib.h>
+#include <Library/FunctionMockLib.h>
+extern "C" {
+#include <Uefi.h>
+#include <Library/PlatformPKProtectionLib.h>
+}
+
+struct MockPlatformPKProtectionLib {
+  MOCK_INTERFACE_DECLARATION (MockPlatformPKProtectionLib);
+
+  MOCK_FUNCTION_DECLARATION (
+    EFI_STATUS,
+    DisablePKProtection,
+    ()
+    );
+};
+
+#endif