trie: remove parameter 'fromLevel' in Prove (#27512)

This removes the feature where top nodes of the proof can be elided.
It was intended to be used by the LES server, to save bandwidth 
when the client had already fetched parts of the state and only needed
some extra nodes to complete the proof. Alas, it never got implemented
in the client.

light/odr_test.go

@@ -95,7 +95,7 @@ func (odr *testOdr) Retrieve(ctx context.Context, req OdrRequest) error {
 			panic(err)
 		}
 		nodes := NewNodeSet()
-		t.Prove(req.Key, 0, nodes)
+		t.Prove(req.Key, nodes)
 		req.Proof = nodes
 	case *CodeRequest:
 		req.Data = rawdb.ReadCode(odr.sdb, req.Hash)

light/trie.go

@@ -192,7 +192,7 @@ func (t *odrTrie) GetKey(sha []byte) []byte {
 	return nil
 }
 
-func (t *odrTrie) Prove(key []byte, fromLevel uint, proofDb ethdb.KeyValueWriter) error {
+func (t *odrTrie) Prove(key []byte, proofDb ethdb.KeyValueWriter) error {
 	return errors.New("not implemented, needs client/server interface split")
 }