Lionel Richie thinks Katy Perry’s ‘American Idol’ exit “makes sense”. The 74-year-old singer has starred alongside Katy, 39, on the hit TV show for years, but he can understand why she’s decided to walk away from ‘American Idol’ at this point in time. During an appearance on ‘Jimmy Kimmel Live!’, Lionel said: “We didn’t know about it, but it makes sense. “In other words: The reason I love coming on the show with you and the reason I’m doing ‘American Idol’ is because I have 400 years of stories and a life in the music business. I have things that I’ve done.” Lionel acknowledged that Katy is at…