move back ivas_dec() into ivas_dec.c
- Related issues: ivas-codec-pc/ivas-codec#880 (closed)
- Requested reviewers: @pihlajakuja or @norvell or @multrus
Reason why this change is needed
- Inconsistent function and file names for ivas_dec().
Description of the change
- Move principal IVAS decoder-related functions to ivas_dec.c
- Move principal IVAS internal-renderer-related functions to ivas_dec_render.c
Affected operating points
- All is BE.