No functional changes. Still use quantized subband with W_subband = 16 bits and no fraction as input.

Rename c_sdp_W_fsub_wg into c_sdp_W_local_oscillator. Use func_wpfb_map_real_input_wpfb_parameters_to_complex_input() to derive c_sdp_wpfb_complex_subbands from c_sdp_wpfb_subbands.

Resolve L2SDP-836

Closes L2SDP-836

See merge request desp/hdl!288