Use dynamic scaling depending on autocorr length to avoid signed integer overflow. Bug: 186706541 Test: atest android.media.cts.DecoderTestAacFormat android.media.cts.DecoderTestXheAac android.media.cts.DecoderTestAacDrc Change-Id: Ibc035ce2eafe4b0d98377d090adad77bbf5cbb5c