binman: blob_dtb: Add fake_size argument to ObtainContents()

The method 'connect_contents_to_file()' calls ObtainsContents() with
'fake_size' argument. Without providing the argument in the blob_dtb
we are not able to call this method without error.

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/binman/etype/blob_dtb.py

@@ -38,7 +38,7 @@ class Entry_blob_dtb(Entry_blob):
             self.Raise("Invalid prepend in '%s': '%s'" %
                        (self._node.name, self.prepend))
 
-    def ObtainContents(self):
+    def ObtainContents(self, fake_size=0):
         """Get the device-tree from the list held by the 'state' module"""
         self._filename = self.GetDefaultFilename()
         self._pathname, _ = state.GetFdtContents(self.GetFdtEtype())