s/RuntimeException/RemoteException for unimplemented methods

Calling an unimplemented method causes RemoteException rather than
RuntimeException.

Bug: 167632276
Test: aidl_unittest, aidl_integration_test
Test: NetworkStackCoverageMtsConfigTests
Change-Id: Id302b5d984bd57ec0d9ecd1d0a42976760864939
3 files changed