MdeModulePkg: Add CapsuleOnDiskLoadPei PEIM.

https://github.com/tianocore/tianocore.github.io/wiki/UEFI-Capsule-
on-Disk-Introducation

This module provides PPI to load Capsule On Disk temp relocation file
from Root Directory file system, retrieve the capsules from the temp
file and create capsule hobs for these capsules.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Chao B Zhang <chao.b.zhang@intel.com>
Signed-off-by: Wei6 Xu <wei6.xu@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Chao B Zhang <chao.b.zhang@intel.com>

MdeModulePkg/Universal/CapsuleOnDiskLoadPei/CapsuleOnDiskLoadPei.uni

@@ -0,0 +1,15 @@
+// /** @file
+// Caspule On Disk Load module.
+//
+// Load Capsule On Disk and build CV hob.
+//
+// Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Caspule On Disk Load module."
+
+#string STR_MODULE_DESCRIPTION          #language en-US "Load Capsule On Disk and build CV hob."