leaudio: Fix audio config notification to Java

With this patch, we make sure that proper supported contexts are sent
up to the Java layer.
It could happen that following updates would override proper context
leading to Out Device being disabled.

Bug: 236595523
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: Ie8ccaa359f25635637677c6529173311094ce134
Merged-In: Ie8ccaa359f25635637677c6529173311094ce134
(cherry picked from commit 33d69325)