Integration of fixed point sub-functions - 6

[x] OMASA decoder config updates
[x] Removed intermediate conversions in ivas_mct_core_dec
[x] FTF changes for dirac_dec_decorr function
[x] ivas_jbm_dec_copy_tc_no_tsm and ivas_ism_param_dec_tc_gain_ajust
converted to fixed point
[x] AGC encoder module conversion