binder: delegate cert verification to RpcCertificateVerifier

RpcTransportCtxFactoryTls pass verifier to contexts.

Instead of using a custom verify function that always returns
ssl_verify_ok, RpcTransportCtxTls call verifier to verify the
certificate.

Test: binderRpcTest
Bug: 198833574
Change-Id: I5c17f46447cfc84e418efff70a0bcbbeaa45bb22
1 file changed