ShellPkg: acpiview: Allow disabling consistency checks (-q flag)

The current documentation for the acpiview UEFI shell tool states
that the '-c' flag enables consistency checks on ACPI table data.
However, these checks are enabled anyway by default.

This patch keeps ACPI table validation as a default option, but it
makes it possible to turn ACPI table validation off by setting the
newly-introduced '-q' flag. Consequently, the '-c' flag is removed.

The remaining code changes in this patch make a number of consistency
checks optional (but enabled by default):
1. ACPI table field offset mismatch.
2. ACPI table field validation functions provided in the ACPI_PARSER
   arrays.
3. Table checksum computation.

Signed-off-by: Krzysztof Koch <krzysztof.koch@arm.com>
Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Reviewed-by: Zhichao Gao <zhichao.gao@intel.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiView.h

@@ -1,7 +1,7 @@
 /** @file
   Header file for AcpiView
 
-  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
 **/
 
@@ -91,6 +91,27 @@ SetColourHighlighting (
   BOOLEAN Highlight
   );
 
+/**
+  This function returns the consistency checking status.
+
+  @retval TRUE if consistency checking is enabled.
+**/
+BOOLEAN
+GetConsistencyChecking (
+  VOID
+  );
+
+/**
+  This function sets the consistency checking status.
+
+  @param  ConsistencyChecking   The consistency checking status.
+
+**/
+VOID
+SetConsistencyChecking (
+  BOOLEAN ConsistencyChecking
+  );
+
 /**
   This function processes the table reporting options for the ACPI table.