Remove ResourceManagerService AIDL api versioning

On R, this interface is only used on system side, not on apex. This
is because we no longer want to mainline the MediaCodec client side
code in R. Remove versioning and the api snapshot as we don't need
to lock down this API in R.

bug: 147585717
test: build
Change-Id: If7432b351468934bf1fe67e9ea41dca83d6d078a