Load sw C2 codecs from apex

bug: 111407413
test: crosshatch-userdebug builds, verified C2 sw codecs are used in image
decoding and audio playback;
CTS media heavy presubmit:https://atp.googleplex.com/test_runs/32791402 (failures are pre-existing)

Change-Id: I56f1a98d906ecb1b5b56e642b44eb394d58c9318