Apply the workaround for the CIS->SCO handover

Set system property persist.bluetooth.leaudio.notify.idle.during.call
to true to receive the notification when LeAudio group turned idle

Bug: 297312397
Test: Switch LE Audio device to HFP device during phone call, and
ensure the HFP device can hear sound and don't have buzzing sound.

Change-Id: Id89c9325f5158113dd653d2267167d4d0e59c935