Partially revert "stream: reduce internal usage of public require of …

…util"

This partially reverts commit c97851d.

Streams code should ideally require on public APIs as much as possible,
because it is exported as readable-stream.

Refs: nodejs#26698
Refs: nodejs/readable-stream#416

lib/internal/streams/buffer_list.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const { Buffer } = require('buffer');
-const { inspect } = require('internal/util/inspect');
+const { inspect } = require('util');
 
 module.exports = class BufferList {
   constructor() {

lib/stream.js

@@ -45,7 +45,7 @@ Stream.Stream = Stream;
 
 // Internal utilities
 try {
-  const types = require('internal/util/types');
+  const types = require('util').types;
   if (types && typeof types.isUint8Array === 'function') {
     Stream._isUint8Array = types.isUint8Array;
   } else {