MdePkg: Add manageability status code

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4483

This change introduces EFI_COMPUTING_UNIT_MANAGEABILITY status code.
EFI_COMPUTING_UNIT_MANAGEABILITY is created as one of the subclasses in
computing unit class. EFI_COMPUTING_UNIT_MANAGEABILITY will be used in
edk2 RedfishPkg and edk2-redfish-client RedfishClientPkg to report
Redfish operation errors. It will also be used to report errors in
edk2-platforms ManageabilityPkg.

PI 1.9 specification, 6.4.1.4.9. Manageability Subclass:
* https://uefi.org/specs/PI/1.9/V3_Status_Codes.html#manageability-subclass

RFC:
* https://edk2.groups.io/g/devel/message/105525
* https://edk2.groups.io/g/devel/message/105595
* https://edk2.groups.io/g/rfc/message/802

Signed-off-by: Nickle Wang <[email protected]>

MdePkg/Include/Pi/PiStatusCode.h

@@ -140,6 +140,7 @@ typedef struct {
 #define EFI_COMPUTING_UNIT_CACHE               (EFI_COMPUTING_UNIT | 0x00040000)
 #define EFI_COMPUTING_UNIT_MEMORY              (EFI_COMPUTING_UNIT | 0x00050000)
 #define EFI_COMPUTING_UNIT_CHIPSET             (EFI_COMPUTING_UNIT | 0x00060000)
+#define EFI_COMPUTING_UNIT_MANAGEABILITY       (EFI_COMPUTING_UNIT | 0x00070000)
 ///@}
 
 ///
@@ -343,6 +344,16 @@ typedef struct {
 #define EFI_CHIPSET_EC_INTRUDER_DETECT  (EFI_SUBCLASS_SPECIFIC | 0x00000003)
 ///@}
 
+///
+/// Computing Unit Manageability Subclass Error Code definitions.
+/// The detail information is reported by REPORT_STATUS_CODE_WITH_EXTENDED_DATA
+//  with ASCII string in EFI_STATUS_CODE_STRING_DATA.
+///@{
+#define EFI_MANAGEABILITY_EC_REDFISH_COMMUNICATION_ERROR         (EFI_SUBCLASS_SPECIFIC | 0x00000000)
+#define EFI_MANAGEABILITY_EC_REDFISH_HOST_INTERFACE_ERROR        (EFI_SUBCLASS_SPECIFIC | 0x00000001)
+#define EFI_MANAGEABILITY_EC_REDFISH_BOOTSTRAP_CREDENTIAL_ERROR  (EFI_SUBCLASS_SPECIFIC | 0x00000002)
+///@}
+
 ///
 /// Peripheral Subclass definitions.
 /// Values of 12-127 are reserved for future use by this specification.