Move vdc commands over to Binder.

Use nice clean AIDL instead of dirty sockets.

avc: denied { call } for pid=603 comm="vdc" scontext=u:r:vdc:s0 tcontext=u:r:servicemanager:s0 tclass=binder permissive=0

Test: vdc cryptfs init_user0
Bug: 13758960
Change-Id: I8b0e63adad8c4c7e2b5e6aca48386d1b371ea6a5