Clean-up nr_slot_fep
First part of !2196 (closed).
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Create new funtion nr_symbol_fep() to do OFDM demod of one symbol on all antennas. This is called by nr_slot_fep() for now. In future, this function will be called directly after reading each OFDM symbol from the radio.
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Removed redundant memory alignment. DFT function performs memory alignment if the input memory is not aligned.