Remove all class load hook initialization

Native code initialization is handled in RavenwoodDriver and should no
longer depend on individual class load hook callbacks.

Bug: 292141694
Flag: EXEMPT host side change only
Test: f/b/r/scripts/run-ravenwood-tests.sh
Change-Id: I61c7b707dfa4fa764b2b63e8edc1bb1c6344b2e7