Make sure to remove final from nested classes too

Nested classes' access flags are actually stored in "inner_classes"
fields.

Fix: 416773120
Bug: 415310569
Flag: EXEMPT host test change only

Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -s
Test: atest CarLibHostUnitTest:android.car.media.CarAudioManagerUnitTest#switchAudioZoneToConfig_withNullConfig_fails

Change-Id: Id5a7d49495329eadffc3ba59be23666970b92f05