The kitchen presented by Morgan Creek this year is a minimalist marvel designed by architect Steve Kemp of Kemp Hall Studio.   Together with an adjoining butler pantry and family entry, the kitchen creates the heart of this lovely Brookhaven home, recently remodeled by Berndsen Custom Homes with their usual fine attention to detail.    Morgan Creek has always strived to make kitchens that break free of the ordinary  and Steve Kemp's design is an interesting blend of strict contemporary cabinetry set into a softer atmosphere of painted plank walls.   The result is a wonderful streamlined trio of functional rooms that do not seem crammed with cabinetry.