[PATCH] MdePkg/Acpi64: Update Error Severity type for Generic Error Status Block

["Wu, Hao A" <hao.a.wu@intel.com>]

Starting from ACPI Specification Version 5.1 Errata B, the term
'Correctable' is no longer being used as an error severity of the
reported error in Chapter 18 APEI.

This commit adds a new macro to reflect this and also keeps the origin
definition (but add comments to make it deprecated) for compatibility
consideration.

Please also note that this commit only updates Acpi64.h and
does NOT update below headers:
Acpi51.h
Acpi60.h
Acpi61.h
Acpi62.h
Acpi63.h

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Hao A Wu <hao.a.wu@intel.com>
---
 MdePkg/Include/IndustryStandard/Acpi64.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Include/IndustryStandard/Acpi64.h b/MdePkg/Include/IndustryStandard/Acpi64.h
index a79b7f2eaa..232697f228 100644
--- a/MdePkg/Include/IndustryStandard/Acpi64.h
+++ b/MdePkg/Include/IndustryStandard/Acpi64.h
@@ -1,7 +1,7 @@
 /** @file
   ACPI 6.4 definitions from the ACPI Specification Revision 6.4 Jan, 2021.
 
-  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2017 - 2022, Intel Corporation. All rights reserved.<BR>
   Copyright (c) 2019 - 2021, ARM Ltd. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -1783,10 +1783,16 @@ typedef struct {
 //
 // Boot Error Severity types
 //
-#define EFI_ACPI_6_4_ERROR_SEVERITY_CORRECTABLE  0x00
+#define EFI_ACPI_6_4_ERROR_SEVERITY_RECOVERABLE  0x00
 #define EFI_ACPI_6_4_ERROR_SEVERITY_FATAL        0x01
 #define EFI_ACPI_6_4_ERROR_SEVERITY_CORRECTED    0x02
 #define EFI_ACPI_6_4_ERROR_SEVERITY_NONE         0x03
+//
+// The term 'Correctable' is no longer being used as an error severity of the
+// reported error since ACPI Specification Version 5.1 Errata B.
+// The below macro is considered as deprecated and should no longer be used.
+//
+#define EFI_ACPI_6_4_ERROR_SEVERITY_CORRECTABLE  0x00
 
 ///
 /// Generic Error Data Entry Definition
-- 
2.27.0.windows.1