Correction ofo simd.h for AVX512

lib/include/srslte/phy/utils/simd.h

@@ -707,11 +707,13 @@ static inline void srslte_simd_cf_storeu(float *re, float *im, simd_cf_t simdreg
 
 static inline simd_f_t srslte_simd_cf_re(simd_cf_t in) {
   simd_f_t out = in.re;
+#ifndef LV_HAVE_AVX512
 #ifdef LV_HAVE_AVX2
   /* Permute for AVX registers (mis SSE registers) */
   const __m256i idx = _mm256_setr_epi32(0, 2, 4, 6, 1, 3, 5, 7);
   out = _mm256_permutevar8x32_ps(out, idx);
 #endif /* LV_HAVE_AVX2 */
+#endif /* LV_HAVE_AVX512 */
   return out;
 }