speech: Add lenient SpeechRecognizer instantiation

This change allows to test on-device listening via a temporary
recognizer even in devices that do no support on device recognition.

It moves the failure from the static
SpeechRecognizer#createOnDeviceSpeechRecognizer to the instance #startListening.

fail-on-listening

Bug: 192586674
Test: atest CtsVoiceRecognitionTestCases with both config and no config
Change-Id: Id722f4e5167132b76b4fbd5ea0c2ef7d19f15909