MdeModulePkg/AhciPei: Add AHCI mode ATA device support in PEI

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1409

This commit will add the AHCI mode ATA device support in the PEI phase.

More specifically, the newly add AhciPei driver will consume the ATA AHCI
host controller PPI for ATA controllers working under AHCI code within the
system. And then produces the below PPIs for each controller:

EDKII PEI ATA PassThru PPI
Storage Security Command PPI

Also, the driver will consume the S3StorageDeviceInitList LockBox in S3
phase. The purpose is to perform an on-demand (partial) ATA device
enumeration/initialization on each controller to benefit the S3 resume
performance.

The implementation of this driver is currently based on the below
specifications:
Serial ATA Revision 2.6
Serial ATA Advanced Host Controller Interface (AHCI) 1.3.1
AT Attachment with Packet Interface - 6 (ATA/ATAPI-6)

Cc: Jian J Wang <jian.j.wang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>

MdeModulePkg/Bus/Ata/AhciPei/AhciPei.uni

@@ -0,0 +1,21 @@
+// /** @file
+// The AhciPei driver is used to manage ATA hard disk device working under AHCI
+// mode at PEI phase.
+//
+// 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 "Manage AHCI mode ATA hard disk device at PEI phase"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "The AhciPei driver is used to manage ATA hard disk device working under AHCI mode at PEI phase."