Remove unused modules made for non-Treble OMX

All devices should use Treble with OMX hals now.

This CL removes
1. Non-Treble implementations of OMX and OMXStore
2. MediaCodecService
3. All dependencies on sysprop system.persist.treble_omx

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 -j123 && vts-tradefed run commandAndExit vts \
--skip-all-system-status-check \
--skip-preconditions -m VtsHalMediaOmxV1_0Host \
-l INFO

Bug: 67990472
Change-Id: I245ecf89d30d532f232e05e362e1cea76f5c37de