Luke Voit’s grandma used to pay him $25 per homer

The granny of budding Yankee folk hero Luke Voit says she’s glad she doesn’t pay him by the homer anymore. Years before her brawny first-baseman grandson was wowing Yankee Stadium with his clutch homers — including 10 in September, leading the team and double the number slugging teammate Giancarlo Stanton hit for the month —…