Encoder SCE/CPE cleanup, SBA/OMASA LTV crash fixes
[x] pre_proc_front_ivas_fx: partial cleanup
[x] fix for ltv sba crashes
[x] Fix for encoder ltv crash - MASA 2TC at 32.0 kbps, 48kHz in, 48kHz out, DTX on, 5_1 out
[x] Fix for few +10dB LTV crashes
[x] pre_proc_front_ivas_fx: partial cleanup
[x] fix for ltv sba crashes
[x] Fix for encoder ltv crash - MASA 2TC at 32.0 kbps, 48kHz in, 48kHz out, DTX on, 5_1 out
[x] Fix for few +10dB LTV crashes