After 40 years, “Little House on the Prairie” is back for the next generation. The new show returns to the range with some classic characters, including 11-year-old Alice Halsey stepping into Melissa Gilbert’s shoes as Laura. “Extra” spoke with Alice, who shared her reaction to getting the role. She said, “When I was told I had gotten Laura, I started to cry. Laura is an icon.” Skywalker Hughes plays Mary, the sister of Laura. She commented, “…