make inclusion guard defines consistent with LAMMPS and avoid redefinition of MAX()

#include "kokkos_type.h"

#ifndef MAX

#define MAX(A,B) ((A) > (B) ? (A) : (B))

#endif

// data types for 2d/3d FFTs

#ifndef FFT_DATA_KOKKOS_H

#define FFT_DATA_KOKKOS_H

#ifndef LMP_FFT_DATA_KOKKOS_H

#define LMP_FFT_DATA_KOKKOS_H

// User-settable FFT precision

   See the README file in the top-level LAMMPS directory.

------------------------------------------------------------------------- */

#ifndef KOKKOS_BASE_FFT_H

#define KOKKOS_BASE_FFT_H

#ifndef LMP_KOKKOS_BASE_FFT_H

#define LMP_KOKKOS_BASE_FFT_H

#include "fftdata_kokkos.h"