ArmPkg: MmCommunicationPei: Introduce MM communicate in PEI

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4464

This change introduced the MM communicate support in PEI phase for ARM
based platforms. Similar to the DXE counterpart, `PcdMmBufferBase` is
used as communicate buffer and SMC will be invoked to communicate to
TrustZone when MMI is requested.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>

Co-authored-by: Ronny Hansen <hansen.ronny@microsoft.com>
Co-authored-by: Shriram Masanamuthu Chinnathurai <shriramma@microsoft.com>
Co-authored-by: Preshit Harlikar <pharlikar@microsoft.com>
Signed-off-by: Kun Qin <kuqin@microsoft.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.inf

@@ -0,0 +1,40 @@
+## @file -- MmCommunicationPei.inf
+#  PEI MM Communicate driver
+#
+#  Copyright (c) 2016 - 2021, Arm Limited. All rights reserved.<BR>
+#  Copyright (c) Microsoft Corporation.
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = MmCommunicationPei
+  FILE_GUID                      = 58FFB346-1B75-42C7-AD69-37C652423C1A
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = MmCommunicationPeiInitialize
+
+[Sources]
+  MmCommunicationPei.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  ArmPkg/ArmPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  ArmSmcLib
+  PeimEntryPoint
+  PeiServicesLib
+  HobLib
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdMmBufferBase
+  gArmTokenSpaceGuid.PcdMmBufferSize
+
+[Ppis]
+  gEfiPeiMmCommunicationPpiGuid     ## PRODUCES
+
+[Depex]
+  TRUE