Memory reduction for audio channels in JBM decoder

• Related issues: #1330 (closed)
• Requested reviewers: @sagnowski

Reason why this change is needed

• There is a potential for memory savings in the JBM decoder, consisting of sharing audio buffers hTcBuffer->tc_buffer[] and st_ivas->p_output_f[][].

Description of the change

• Sharing of audio buffers hTcBuffer->tc_buffer[] and st_ivas->p_output_f[][] is done.

Affected operating points

• All is BE.
• Heap RAM is reduced for JBM decoding in all formats. The reduction is proportional to the decoder's number of audio channels and it is at the amount of 2% - 5%. E.g.:

all JBM decoding, 48 kHz in/out	decoder heap [kBytes]
	main	fix	diff
EVS, 32 kbps, MONO out	229.2	225.3	3.8
stereo, 32 kbps, STEREO out	312.1	304.4	7.7
ISM, 64 kbps, 4 ISM,  BINAURAL out	817.6	802.2	15.4
SBA, 512 kbps, HOA3, BINAURAL out	1,055.4	1,013.2	42.2
OSBA 512 kbps, 3OA, 4 ISMs, BINAURAL out	1,734.8	1,677.2	57.6