BaseTools: Update UPT tool to support multiple workspaces

Update UPT to refer MultipleWorkspace class to convert
the file path from WORKSPACE and PACKAGES_PATH.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hesheng Chen <hesheng.chen@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18580 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/Source/Python/UPT/Library/ParserValidate.py

@@ -27,6 +27,7 @@ from Library.DataType import TAB_SPACE_SPLIT
 from Library.String import GetSplitValueList
 from Library.ExpressionValidate import IsValidBareCString
 from Library.ExpressionValidate import IsValidFeatureFlagExp
+from CommonDataClass.CommonClass import MultipleWorkspace as mws
 
 ## __HexDigit() method
 #
@@ -236,7 +237,7 @@ def IsValidPath(Path, Root):
     
     Path = os.path.normpath(Path).replace('\\', '/')
     Root = os.path.normpath(Root).replace('\\', '/')
-    FullPath = os.path.normpath(os.path.join(Root, Path)).replace('\\', '/')
+    FullPath = mws.join(Root, Path)
     
     if not os.path.exists(FullPath):
         return False