Revert "AndroidRuntime: Expose javaAttachThread / javaDetachThread."

Revert "RpcSession attaches/detaches JVM for Java thread"

Revert submission 1751551-rpc_binder_java_threads

Reason for revert: breaks build
Reverted Changes:
Ifedd34a8c:AndroidRuntime: Expose javaAttachThread / javaDeta...
I23f171dd1:RpcSession attaches/detaches JVM for Java thread

Fixes: 193742361
Fixes: 193742372

Change-Id: I979f676fe17227eefa630e2a169b4f45862f2ae3