Audio HAL: Add optional Destination to SinkMetadata

Currently this is used to indicate the output device
when the input stream is from an intermediate processing
module like MSD.

Bug: 120859615
Test: make
Change-Id: I60bac5c24a263ab0b8965e9dbf9514445e88c270
diff --git a/audio/5.0/IDevice.hal b/audio/5.0/IDevice.hal
index afb4fad..9e45ba5 100644
--- a/audio/5.0/IDevice.hal
+++ b/audio/5.0/IDevice.hal
@@ -133,7 +133,7 @@
      * @param config stream configuration.
      * @param flags additional flags.
      * @param sinkMetadata Description of the audio that is suggested by the client.
-     *                     May be used by implementations to configure hardware effects.
+     *                     May be used by implementations to configure processing effects.
      * @return retval operation completion status.
      * @return inStream in case of success, created input stream.
      * @return suggestedConfig in case of invalid parameters, suggested config.