Harmonize tcx_ltp_pitch_search_*(), tcx_ltp_find_gain_*fx()
# Bug description Seems the function pairs * `tcx_ltp_pitch_search()` and `tcx_ltp_pitch_search_ivas_fx()` * `tcx_ltp_find_gain()` and `tcx_ltp_find_gain_ivas_fx()` could be harmonized in a BE way with little effort...
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