[QEMU] Allow building with the debug FSP

Fix two errors that prevent building QEMU SBL with the debug FSP on Linux:
- 0001-Build-QEMU-FSP-2.0-binaries.patch adds a variable "RegMask8" to
  FspmInitEntryPoint() that is written but not read; GCC treats this as
  an error;
- the resulting STAGE2 binary is larger than the 0x18000 bytes allocated
  for it.

Signed-off-by: Bruno Achauer <bruno.achauer@intel.com>

Platform/QemuBoardPkg/BoardConfig.py

@@ -1,7 +1,7 @@
 ## @file
 # This file is used to provide board specific image information.
 #
-#  Copyright (c) 2017 - 2021, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2017 - 2022, Intel Corporation. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -105,7 +105,7 @@ class Board(BaseBoard):
         if self.NO_OPT_MODE:
             self.STAGE1A_SIZE    += 0x1000
         self.STAGE1B_SIZE         = 0x00030000
-        self.STAGE2_SIZE          = 0x00018000
+        self.STAGE2_SIZE          = 0x0001A000
 
         self.TEST_SIZE            = 0x00001000
         self.SIIPFW_SIZE          = 0x00010000