Move mediaswcodec service to APEX

bug: 127499775
test:
- adb shell lshal debug android.hardware.media.c2@1.0::IComponentStore/software
check all software c2 codecs are still listed
- clean-built image shouldn't have mediaswcodec in /system/bin
- atest CtsMediaTestCases -- --module-arg CtsMediaTestCases:size:small
- atest media_swcodec_e2e_tests
Change-Id: I96df803c29aa595dfd2b51d5a68d6db2c08726f3