[non-BE] Resolve "AGC memory reset missing in SCE coding"

• Related issues: #2315 (closed)
• Requested reviewers:

Reason why this change is needed

• AGC memory reset is missing in SCE coding.

Description of the change

• FIX AGC memory reset.

Affected operating points

• Not BE for SCE decoding, ACELP core, for TC signals with very high energy.

Closes