Mismatch of expected and provided function argument size in McMASA enc

Found in #887 (closed)

McMASA encoding calls the functions computeIntensityVector_enc (in ivas_mcmasa_enc.c) and computeReferencePower_enc (in ivas_dirac_enc.c) with buffers of size [FOA_CHANNELS][DIRAC_NO_FB_BANDS_MAX] while the functions interface defines buffers of size [DIRAC_MAX_ANA_CHANS][DIRAC_NO_FB_BANDS_MAX].

The actual use in the functions does not over-index as

• computeIntensityVector_enc accesses only 4 = FOA_CHANNELS elements, and
• computeReferencePower_enc receives an extra argument defining the number of channels in the data.