coreboot-utils: mark nvramtool x86 only (#511384)

      pname = "nvramtool";

      meta.description = "Read and write coreboot parameters and display information from the coreboot table in CMOS/NVRAM";

      meta.mainProgram = "nvramtool";

      meta.platforms = [

        "x86_64-linux"

        "i686-linux"

      ];

    };

    superiotool = generic {

      pname = "superiotool";