MdePkg/Protocols: New interface, EFI encodings to PCI Plat protocol

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1954

New interface added to PCI Platform Protocol / PCI Override Protocol to
retrieve device-specific platform policy for the following PCI standard
features, like Maximum Payload Size (MPS), Maximum Read Request Size
(MRRS),Extended Tags, Relax Order, No-Snoop, Active State Power Management
(ASPM),Latency Time Reporting (LTR), AtomicOp, Reference Clock
Configuration, Extended SYNCH, PTM support, and Completion Timeout (CTO).
New source files added with enhanced definitions are in:
MdePkg/Include/Protocol/PciPlatform2.h,
MdePkg/Include/Protocol/PciOverride2.h

Signed-off-by: Ashraf Javeed <ashraf.javeed@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
---

In V5: Revised ECR to define new PCI Platform Protocol to support the
PCI Express capability features:-
EFI_PCI_EXPRESS_PLATFORM_PROTOCOL, EFI_PCI_EXPRESS_OVERRIDE_PROTOCOL.
Added new interface -> NotifyDeviceConfiguration
Added new EFI encodings / data types for PCIe features:-
CPM, L1 PM substates.
Enhance the definition of the PCIe feature AtomicOp to support additional
attribute - Egress blocking of the port.

In V4: Redefinition of the existing interfaces in the EFI_PCI_PLATFORM_-
PROTOCOL2, to avoid type casting and to avoid further future change

In V3: License update in the header sections of source files

In V2: Correction made to header sections of source files

MdePkg/Include/Protocol/PciOverride2.h

@@ -14,24 +14,24 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #define _PCI_OVERRIDE2_H_
 
 ///
-/// EFI_PCI_OVERRIDE_PROTOCOL has the same structure with EFI_PCI_PLATFORM_PROTOCOL
+/// EFI_PCI_EXPRESS_OVERRIDE_PROTOCOL has the same structure as of EFI_PCI_EXPRESS_PLATFORM_PROTOCOL
 ///
 #include <Protocol/PciPlatform2.h>
 
 ///
-/// Global ID for the EFI_PCI_OVERRIDE_PROTOCOL
+/// Global ID for the  EFI_PCI_EXPRESS_OVERRIDE_PROTOCOL
 ///
-#define EFI_PCI_OVERRIDE2_GUID \
+#define EFI_PCI_EXPRESS_OVERRIDE_GUID \
   { \
     0xb9d5ea1, 0x66cb, 0x4546, {0xb0, 0xbb, 0x5c, 0x6d, 0xae, 0xd9, 0x42, 0x47} \
   }
 
 ///
-/// Declaration for EFI_PCI_OVERRIDE_PROTOCOL
+/// Declaration for EFI_PCI_EXPRESS_OVERRIDE_PROTOCOL
 ///
-typedef EFI_PCI_PLATFORM_PROTOCOL2 EFI_PCI_OVERRIDE_PROTOCOL2;
+typedef  EFI_PCI_EXPRESS_PLATFORM_PROTOCOL  EFI_PCI_EXPRESS_OVERRIDE_PROTOCOL;
 
 
-extern EFI_GUID   gEfiPciOverrideProtocol2Guid;
+extern EFI_GUID   gEfiPciExpressOverrideProtocolGuid;
 
 #endif