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UE: implement TRS processing in PHY (#199) This PR implements PHY layer processing for CSI-RS tracking signal that estimates the CFO and sends a frequency correction command to the radio when CFO goes above a threshold of 500Hz. A CI test is added with a GNU radio script between OCUDU gNB and the UE that simulates a continuous frequency offset. The test passes if the UE sends a frequency correction command. Reviewed-by: Robert Schmidt <robert.schmidt@openairinterface.org> Reviewed-by: Bartosz Podrygajlo <bartosz.podrygajlo@openairinterface.org> Reviewed-by: Francesco Mani <email@francescomani.it>