Revert "[HA Input] Show notification to hint user can change input device when calling"

This reverts commit 8f561169.

Reason for revert: Likely culprit for b/388436864  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I14b956e53929d019cde8144d5e4a44cf84dfb1f4