audio: Add offload reconfiguration event to IBluetoothLe

Since BT LE can also have offloaded codecs, it might need
a reconfiguration event similar to the one that BT A2DP
receives.

Bug: 272658632
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I04fb7c99f0457f87e1f4aaf7e77165317163387b