LTV crash fixes and updates for addressing high MLD issue in ISM formats

[x] crash fix for ltv case +10dB : [ltv-stereo bitrate switching from 13.2 kbps to 128 kbps, 32kHz in, 32kHz out]
[x] Fix for High MLD issue in ISM Stream: stv-3 ISM with metadata at 128 kbps, 48 kHz in, 32 kHz out, HOA3 out, random FER at 5%
[x] Resolved LTV crash: +10dB [ltv-stereo at 32 kbps, 32kHz in, 32kHz out, DTX on, MONO out, random FER at 5%]