codec2: Remove unnecessary symbol exports from components

This reduces library size by about 10-15%

Bug: 128423900
Test: cts-tradefed run commandAndExit cts-dev -m CtsMediaTestCases \
 -t android.media.cts.DecoderTest

Change-Id: I52bf6ee760fe5f29c628a66fc95c657fba2d1541
2 files changed