Sub-functions integration - 4

[x]Some sub-function conversion in MASA Path, BASOP and instrumentation changes.
[x]td_bwe_dec_init_fx updates
[x]swb_bwe_dec converted to fixed point
[x]ISM path updates:
   - Integrated updt_dec_common function under ivas_core_dec function.
   - Removed some duplicate variables.
   - Converted all the calls to delay_signal_float function for ISM path.
   - save_synthesis_hq_fec float function call removed.
[x] Intermediate conversions removal for aclep_core_dec