Add Codec2 to mainline_system

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

Bug: 112362730
Bug: 119853704
Change-Id: I563748d4cea04ab09f03109fa8fa7697d35de581