Fix constant propagation pass to consider kwargs

Reviewed By: cccclai, mcremon-meta

Differential Revision: D59345251

Author: Reza Rahimi

exir/passes/constant_prop_pass.py

@@ -126,6 +126,10 @@ def get_propagated_const_tensor_dict(
             node.args,
             exported_program,
             const_node_to_tensor,
+        ) or not is_const(
+            node.kwargs,
+            exported_program,
+            const_node_to_tensor,
         ):
             continue