MdeModulePkg: Add a PEIM to install Debug PPI

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1549

Add a PEIM to install Debug PPI so that PEI debug library
instance can locate gEdkiiDebugPpiGuid to implement the
debug functions. Using this PPI can reduce the size of
PEIMs which consume the debug library.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdeModulePkg/Universal/DebugServicePei/DebugServicePei.uni

@@ -0,0 +1,20 @@
+///** @file
+//  This driver installs gEdkiiDebugPpiGuid PPI to provide
+//  debug services for PEIMs.
+//
+//  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+//
+//  This program and the accompanying materials
+//  are licensed and made available under the terms and conditions of the BSD License
+//  which accompanies this distribution.  The full text of the license may be found at
+//  http://opensource.org/licenses/bsd-license.php
+//
+//  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+//
+//**/
+
+#string STR_MODULE_ABSTRACT             #language en-US "Provide debug services at PEI phase."
+
+#string STR_MODULE_DESCRIPTION          #language en-US "It produces gEdkiiDebugPpiGuid to print message to debug output device"
+