MSAN fixes for STEREO, OSBA High MLD fix

[x] Fix for High MLD issue for a OSBA stream
[x] MSAN fixes - STEREO streams
[x] Fixed crash in ltv48_MC512.wav_Multi_channel_5_1_2_bitrate_switching_from_13_2_kbps_to_512_kbps_48kHz_in_16kHz_out_BINAURAL_ROOM_out.192