FmpDevicePkg: Add FmpDependencyCheck library class and instances

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2696

* This library class provides platform specific services to support
dependency check during updating firmware image. Platform can perform
dependency check in platform specific manner by implementing its own
FmpDependencyCheckLib.
* Add FmpDependencyCheck instance to provide a sample of dependency
check. The sample instance only checks the dependency from capsule
image. The dependency from other FMP instances isn't checked here.
* Add NULL instance as an option to skip the dependency check.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Wei6 Xu <wei6.xu@intel.com>
Reviewed-by: Sean Brogan <sean.brogan@microsoft.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

FmpDevicePkg/Library/FmpDependencyCheckLibNull/FmpDependencyCheckLibNull.c

@@ -0,0 +1,34 @@
+/** @file
+  Null instance of FmpDependencyCheckLib.
+
+  Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <PiDxe.h>
+#include <Library/FmpDependencyCheckLib.h>
+
+/**
+  Check dependency for firmware update.
+
+  @param[in]  ImageTypeId        Image Type Id.
+  @param[in]  Version            New version.
+  @param[in]  Dependencies       Fmp dependency.
+  @param[in]  DependenciesSize   Size, in bytes, of the Fmp dependency.
+
+  @retval  TRUE    Dependencies are satisfied.
+  @retval  FALSE   Dependencies are unsatisfied or dependency check fails.
+
+**/
+BOOLEAN
+EFIAPI
+CheckFmpDependency (
+  IN  EFI_GUID                ImageTypeId,
+  IN  UINT32                  Version,
+  IN  EFI_FIRMWARE_IMAGE_DEP  *Dependencies,    OPTIONAL
+  IN  UINT32                  DependenciesSize
+  )
+{
+  return TRUE;
+}