core/state: simplify proof methods (#17965)

This fixes the import cycle build error in core/vm tests.
There is no need to refer to core/vm for a type definition.

core/vm/interface.go

@@ -35,8 +35,6 @@ type StateDB interface {
 	SetNonce(common.Address, uint64)
 
 	GetCodeHash(common.Address) common.Hash
-	GetProof(common.Address) (ProofList, error)
-	GetStorageProof(common.Address, common.Hash) (ProofList, error)
 	GetCode(common.Address) []byte
 	SetCode(common.Address, []byte)
 	GetCodeSize(common.Address) int
@@ -80,11 +78,3 @@ type CallContext interface {
 	// Create a new contract
 	Create(env *EVM, me ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)
 }
-
-// MerkleProof
-type ProofList [][]byte
-
-func (n *ProofList) Put(key []byte, value []byte) error {
-	*n = append(*n, value)
-	return nil
-}