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/GlobalData.py

@@ -19,6 +19,7 @@ GlobalData
 # The workspace directory 
 #
 gWORKSPACE = '.'
+gPACKAGE_PATH = None
 
 #
 # INF module directory
@@ -107,4 +108,4 @@ gPackageDict = {}
 # Used by Library instance parser
 # {FilePath: FileObj}
 #
-gLIBINSTANCEDICT = {}
+gLIBINSTANCEDICT = {}