[non BE] Resolve "OSBA EXT output wrong for FOA/HOA2 inputs"

• Related issues: #1128 (closed)
• Requested reviewers: @vaclav

Reason why this change is needed

SBA output order differs from input order in OSBA EXT output

Description of the change

set the output order and number of channels as signaled in the bitstream

Affected operating points

bitstream is BE, decoder change only OSBA EXT output is not BE