feat / add the MMSE and precoding

- avoid the finction duplication
  - add the transform predoding to the nr_rx_pusch_tp
  - add the MMSE for 2 layer which modulation greater than 16 qam
  - can support to 256 qam for 1 layer and 2 layer

CMakeLists.txt

@@ -1040,6 +1040,7 @@ set(PHY_SRC_UE
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/dmrs_nr.c
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/ptrs_nr.c
   ${OPENAIR1_DIR}/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+  ${OPENAIR1_DIR}/PHY/NR_ESTIMATION/nr_freq_equalization.c
   ${OPENAIR1_DIR}/PHY/NR_ESTIMATION/nr_measurements_gNB.c
   ${OPENAIR1_DIR}/PHY/TOOLS/file_output.c
   ${OPENAIR1_DIR}/PHY/TOOLS/cadd_vv.c