ArmVirtPkg: Add cspell exceptions

The cpsell tool checks for unknown words in the upstream CI.
Add some new words to the list of exceptions.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

ArmVirtPkg/ArmVirtPkg.ci.yaml

@@ -6,7 +6,7 @@
 #
 # Copyright (c) Microsoft Corporation
 # Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
-# Copyright (c) 2020, ARM Limited. All rights reserved.
+# Copyright (c) 2020 - 2022, ARM Limited. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
@@ -48,6 +48,7 @@
             "MdePkg/MdePkg.dec",
             "MdeModulePkg/MdeModulePkg.dec",
             "ArmVirtPkg/ArmVirtPkg.dec",
+            "DynamicTablesPkg/DynamicTablesPkg.dec",
             "NetworkPkg/NetworkPkg.dec",
             "ArmPkg/ArmPkg.dec",
             "OvmfPkg/OvmfPkg.dec",
@@ -98,6 +99,9 @@
         "AuditOnly": False,           # Fails right now with over 270 errors
         "IgnoreFiles": [],           # use gitignore syntax to ignore errors in matching files
         "ExtendWords": [
+            "acpiview",
+            "armltd",
+            "ssdts",
             "setjump",
             "plong",
             "lparam",