VIS : SoundTriggerService: fix fake AudioRecord creation

Make sure exceptions that can occur when creating the fake AudioRecord
instance in SoundTriggerService.createAudioRecordForEvent() are caught.

Bug: 161375011
Test: Manual sound trigger regression with OK Google and Now Playing
Change-Id: Ie367b9dda6f9e4f3079f5afe2ac92fc98cf8bced