binder: RpcTranportTest delete extra raw transport test

Only 3 combinations:
- raw sockets
- TLS with PEM cert
- TLS with DER cert

Also minor fixes to RpcTransport.Trigger.

Test: binderRpcTest
Change-Id: I6c1cf5c768d55e99c9a9b389969d25f19e3c2b8c
1 file changed