LeAudio: Fix not respecting the configuration provider ASE metadata

The metadata received from the configuration provider over the AIDL
should be respected as a base, which gets extended with (while
currently being limited to) what the BT host stack decides to set
(streaming context, CCID list, etc).

Bug: 388733112
Test: atest bluetooth-test-audio-hal-le-audio-software bluetooth-test-audio-hal-aidl-leaudio-utils bluetooth_le_audio_test bluetooth_le_audio_client_test bluetooth_le_audio_codec_manager_test
Flag: EXEMPT; day to day fix - covered by new unit tests, regression tested with the existing unit tests
Change-Id: Ic3aa37b11a5a8ca1b8478e488a21cd166276a3ac