Allow portMode configuration in loaded state only

Test: make cts -j123 && cts-tradefed run cts-dev -m \
CtsMediaTestCases --compatibility:module-arg \
CtsMediaTestCases:include-annotation:\
android.platform.test.annotations.RequiresDevice

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_0Test -l INFO

Bug: 63796949

Merged-In: Ib9d3d51954ad56d4240dc055dd2e53ce14e49054
Change-Id: Ib9d3d51954ad56d4240dc055dd2e53ce14e49054