Remvoe unused, unimplemented methods on XlaInterpreterExecutor.
Remvoe unused, unimplemented methods on XlaInterpreterExecutor.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12228 from trevor-m:tmorris-norm-init f53533087ba1ddcf65ad7cc6268ee89de4690d15
