BaseTools: Fixed issue of incorrect Module Unique Name

https://bugzilla.tianocore.org/show_bug.cgi?id=2088
If there are more than one override instance for a same module,
the Module Unique Name is generated incorrectly.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Steven Shi <steven.shi@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/AutoGen/ModuleAutoGen.py

@@ -295,7 +295,7 @@ class ModuleAutoGen(AutoGen):
         ModuleNames = self.DataPipe.Get("M_Name")
         if not ModuleNames:
             return self.Name
-        return ModuleNames.get(self.Name,self.Name)
+        return ModuleNames.get((self.Name,self.MetaFile),self.Name)
 
     # Macros could be used in build_rule.txt (also Makefile)
     @cached_property