ShellPkg: acpiview: Remove '/?' from valid command line flags

Acpiview currently allows displaying help info by specifying both
-? and /? flags. This patch removes /? from valid command line
flags that can be passed to the acpiview tool, as this
flag is not used for such purpose in other UEFI shell commands.

Signed-off-by: Krzysztof Koch <krzysztof.koch@arm.com>

ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.c

@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.
+  Copyright (c) 2016 - 2019, ARM Limited. All rights reserved.
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -33,7 +33,6 @@ STATIC BOOLEAN            mColourHighlighting;
   An array of acpiview command line parameters.
 **/
 STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
-  {L"/?", TypeFlag},
   {L"-c", TypeFlag},
   {L"-d", TypeFlag},
   {L"-h", TypeValue},