Mismatch of the expected and provided function argument size in DFT/MDCT stereo functions

• Related issues: #887 (closed)
• Requested reviewers: @fotopoulou, @sagnowski

Reason why this change is needed

The size of some buffers/arrays that are supplied as inputs to DFT/MDCT stereo functions have their size not consistent with the expected (defined) size. This causes a warning when compiled with gcc v 11.4.0.

TNSAnalysisStereo()
stereo_dft_dec_read_BS()
stereo_dft_dec_res()
stereo_decoder_tcx()
res_bpf_adapt()

Description of the change

The definition of these buffers/arrays shall be modified such that the dimension/size is consistent with the truly-supplied parameters.

Affected operating points

BE modification.