leaudio: Make multiple context suppport default

Android shall not limit information shared with Audio Server.
As per CAP v1.0 sec. 7.1
"
If multiple Context Type values are set, the associated Audio Stream simultaneously
serves multiple use cases and can be a mixture of multiple sources of audio.
"

Bug: 251343282
Bug: 230553199
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: Ie3ef5d50e89842653f118263e6980f478e1d9a0f