AAC Core coder changes to take the output samples as 32 bit
and subject to peak limiter to avoid any clipping , at the
same time maintaining precision.
Bug: 175435457
Test: atest CtsMediaTestCases:DecoderTest
Test: atest CtsMediaTestCases:DecoderTestAacDrc
Test: atest CtsMediaTestCases:DecoderTestXheAac
Test: atest CtsMediaTestCases:DecoderTestAacFormat
Test: atest CtsMediaV2TestCases:CodecDecoderTest