Adapt scaling in combineSignalCplxScale*() to prevent signed integer overflows. Bug: 186777497 Test: atest android.media.cts.DecoderTestAacFormat android.media.cts.DecoderTestXheAac android.media.cts.DecoderTestAacDrc Change-Id: If773c90ccd256fd03641446c7f8bd82d04a100e4