hal: open proxy record2 only when hearing aid is connected

Proxy record2 can be wrongly selected for common afe
proxy session which can cause proxy port mute due to
wrong port selected.
Since proxy record2 is dedicated for hearing aid,only
open proxy record2 when hearing aid is connected.

Change-Id: I1d2bf0ad97c7c0e14fc9e4dc083c21eb04fb4f12