BaseTools/VfrCompile: Remove framework VFR support

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1464

Currently there is no usage of framework VFR,
remove the support from VfrCompile.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/C/VfrCompile/VfrFormPkg.h

@@ -2,7 +2,7 @@
 
   The definition of CFormPkg's member function
 
-Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2019, Intel Corporation. All rights reserved.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -95,7 +95,6 @@ struct SBufferNode {
 };
 
 typedef struct {
-  BOOLEAN  CompatibleMode;
   EFI_GUID *OverrideClassGuid;
 } INPUT_INFO_TO_SYNTAX;