Loop all decode tests for all port modes supported

Many tests run their test with port mode configured to either
byte buffer mode or dynamic anw buffer mode but not both.
This change ensures that all test cases are tested for all
supported port mode configurations.

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: I600b30e09b478fdf787f0bf0ac6914006e553203