[non-BE][split-non-BE] Resolve "Fix Highpass filtering for ParamUpmix"

• Related issues:#802 (closed)
• Requested reviewers: sbayer

Reason why this change is needed

ParamUpmix is doing HP filtering after ParamUpmix decoding, it should be moved to before, aligning with other modes.

Description of the change

As above

Affected operating points

Operating points: 7.1.4 160kbps

Bitstream should be unchanged

Produced decoded output is non-BE but is fully backwards compatible for decoding.