nixos/throttled: Use `hardware.cpu.x86.msr`

    # Kernel 5.9 spams warnings whenever userspace writes to CPU MSRs.

    # See https://github.com/erpalma/throttled/issues/215

    boot.kernelParams =

      optional (versionAtLeast config.boot.kernelPackages.kernel.version "5.9")

      "msr.allow_writes=on";

    hardware.cpu.x86.msr.settings.allow-writes =

      mkIf (versionAtLeast config.boot.kernelPackages.kernel.version "5.9") "on";

  };

}