PrmPkg: Add package and include headers

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3812

Adds a new package to maintain Platform Runtime Mechanism (PRM)
support.

This package is intended to include generic code that provides a
common infrastructure to support PRM in firmware and a collection
of sample PRM modules that demonstrate how to use the interfaces
and other package resources to author a PRM module.

The following initial headers are included in this commit:

* Prm.h - Includes common content for PRM with no dependencies on
  other PRM header files.

* PrmContextBuffer.h - Includes definitions for PRM context buffers.

  Context buffers are standardized structures that point to various
  resources available to a PRM handler during its execution.

* PrmDataBuffer.h - Includes definitions for PRM data buffers.

  Within the context of PRM, these data buffers are composed of a
  generic header followed by a variable length blob of arbitrary
  data.

* PrmExportDescriptor.h - Includes definitions for  creating PRM
  export descriptors.

  A PRM export descriptor is a structure referenced in the export
  table of PRM module that contains PRM-specific metadata about the
  module.

* PrmMmio.h - Includes definitions for describing MMIO ranges uses
  by PRM modules.

* PrmModule.h - Includes definitions commonly used by PRM module
  authors.

  This file is provided to serve as a convenient include for PRM
  module authors.

* PrmOsServices.h - Includes content specific to PRM OS services.

  OS Services will not planned to be present in the final version
  of PRM. The OS Services have been reduced to a simple debug print
  function. So this is currently planned to be a temporary file to
  support debugging during PRM development.

Note: Modules built for the UEFI environment can be built by Visual
      Studio and non-Visual Studio toolchains. However, PRM modules
      are currently only supported on Visual Studio toolchain due to
      usage of export tables.

Cc: Andrew Fish <afish@apple.com>
Cc: Kang Gao <kang.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>

PrmPkg/PrmPkg.dec

@@ -0,0 +1,49 @@
+## @file  PrmPkg.dec
+# This package provides support for the Platform Runtime Mechanism (PRM).
+#
+# The following key elements of PRM are maintained in this package:
+#
+# 1. PRM interfaces - Comprised of interfaces shared with the operating system such as ACPI table structures
+#                     in addition to internal firmware interfaces such as protocols and library interfaces.
+#
+# 2. PRM generic drivers - EDK II drivers that implement generic functionality such that a platform can quickly
+#                          and reliably adopt PRM.
+#
+# 3. PRM module - An independently updatable PE/COFF binary that conforms to the unique requirements of a PRM module.
+#                 PRM modules expose functions for operating system invocation referred to as PRM handlers.
+#
+# 4. PRM handler - A function in a PRM module. The function is identified through PRM interfaces in the OS by a GUID.
+#
+# Copyright (c) Microsoft Corporation<BR>
+## SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  DEC_SPECIFICATION              = 0x00010005
+  PACKAGE_NAME                   = PrmPkg
+  PACKAGE_UNI_FILE               = PrmPkg.uni
+  PACKAGE_GUID                   = 3D22F66E-9090-46CE-B260-1836070AFA5E
+  PACKAGE_VERSION                = 0.1
+
+[Includes]
+  Include
+
+[Guids]
+  gPrmPkgTokenSpaceGuid = { 0x46f56acc, 0x600b, 0x450f, { 0xa5, 0x9c, 0x3a, 0x1a, 0x4a, 0xd4, 0x35, 0x3e }}
+
+[LibraryClasses]
+  ## @libraryclass Provides a general abstraction for PRM context buffer management
+  #
+  PrmContextBufferLib|Include/Library/PrmContextBufferLib.h
+
+[Protocols]
+  ## PRM Configuration Protocol
+  #
+  gPrmConfigProtocolGuid = { 0x4e5b4fea, 0x936a, 0x45bc, { 0xac, 0x6a, 0x2f, 0x8f, 0x14, 0xa6, 0xc2, 0x9e }}
+
+[PcdsFixedAtBuild]
+  ## Flash base address of a PRM firmware volume
+  gPrmPkgTokenSpaceGuid.PcdFlashFvPrmBase|0x00000000|UINT32|0x00000001
+
+  ## Size in bytes of a PRM firmware volume
+  gPrmPkgTokenSpaceGuid.PcdFlashFvPrmSize|0x00000000|UINT32|0x00000002