Add vts audio dec test for flac decoder

Test: make vts -j99 BUILD_GOOGLE_VTS=true TARGET_PRODUCT=aosp_arm64 \
&& vts-tradefed run commandAndExit vts \
--skip-all-system-status-check --primary-abi-only \
--skip-preconditions --module VtsHalMediaOmxV1_0Host \
-l INFO

Bug: 63796949

Change-Id: Ie504de96007c1c0ec6dc9c8b7da78f6c1da45631
3 files changed