BaseTools:GuidedSectionTools.txt is not generated correctly

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2538

For LzmaCompress or BrotliCompress, the platform may use the different
options and add their batch file, such as LzmaCompressPlatform.
Then, specify it in platform.dsc [BuildOptions] to override the default
one in tools_def.txt.

*_*_*_LZMA_PATH = LzmaCompressPlatform

This override tool will be used. But, its name is not specified in the
generated GuidedSectionTools.txt.

Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/AutoGen/PlatformAutoGen.py

@@ -866,7 +866,8 @@ class PlatformAutoGen(AutoGen):
                             Value += " " + self._BuildOptionWithToolDef(RetVal)[Tool][Attr]
                         else:
                             Value = self._BuildOptionWithToolDef(RetVal)[Tool][Attr]
-
+                            Def = '_'.join([self.BuildTarget, self.ToolChain, self.Arch, Tool, Attr])
+                            self.Workspace.ToolDef.ToolsDefTxtDictionary[Def] = Value
                 if Attr == "PATH":
                     # Don't put MAKE definition in the file
                     if Tool != "MAKE":