Audio V4: Update .hal doc to removal of audioSource

As multiple tracks can be connected to the same stream,
the audio source list can be found in metadata.

Bug: 38184704
Test: none
Change-Id: I63e75fd4049fbe469b78cacf0adf44e9597cb422
Merged-In: I63e75fd4049fbe469b78cacf0adf44e9597cb422
Cherry-picked from master
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/audio/4.0/IDevice.hal b/audio/4.0/IDevice.hal
index 7eb03c8..1bb5aba 100644
--- a/audio/4.0/IDevice.hal
+++ b/audio/4.0/IDevice.hal
@@ -132,7 +132,6 @@
      * @param device device type and (if needed) address.
      * @param config stream configuration.
      * @param flags additional flags.
-     * @param source source specification.
      * @param sinkMetadata Description of the audio that is suggested by the client.
      *                     May be used by implementations to configure hardware effects.
      * @return retval operation completion status.