MILWAUKEE — When the 6-foot-7, 240-pound outfielder capable of hitting the ball as hard and as far as just about anybody in the organization walked into his first big league clubhouse on Friday afternoon, he looked and sounded just like a kid again. Spencer Jones found his locker at American Family Field, his No. 78 Yankees jersey hanging inside, and could not stop smiling. He told his manager, Aaron Boone, that it was “the best day ever.” Soon enough, he changed into baseball gear and tried to make things feel normal ahead of making his major league debut against Brewers flamethrower Jacob Misiorowski. “It was pretty awesome, seeing all the lockers, all the numbers, all the jerseys,” Jones said before batting sixth and DHing. “There’s a lot of food here too, which is pretty sweet. Bunch of different things in the bathroom, I don’t know.…