Traditional Japanese minimalism meets Topanga Canyon bohemian inside chef Kenji Koyama’s Necco restaurant in West L.A.Credit...Julia Stotz Necco, a friendly, health-conscious Japanese small-plates restaurant in West L.A., is the kind of place in which Lorde fuels up on wholesome, unpretentious food when she’s in town. It’s helmed by chef Kenji Koyama, who opened it almost exactly one year ago. At