Fix seek handling in AAC and AMR extractors

AAC and AMR encoders were treating all seek operations as SEEK_PREVIOUS_SYNC

Bug: 179062958
Test: atest ExtractorUnitTest -- --enable-module-dynamic-download=true
Change-Id: Ic0dc0824ffa9998d72c750ca0d0a24c8dcc3c8a8
2 files changed