Add Delay reporting for Hearing Aids

Use the RenderDelay parameter from the Hearing Aid devices to implement
the Delay Reporting feature. This will helps in the lip-sync issues.
Please note that this change will requires a re-pair of the Hearing Aids
devices in order for the delay report to work well.

Bug: 132115153
Test: Manual test
Change-Id: If4bef049c18a3912817c2fa96b9bd890d5712c22