audio: Update default wrapper to support V7

During this conversion, the functionality of the V7 wrapper
hasn't been tested yet. This will be done in a separate CL
that will also include required updates to the VTS tests.

Since the changes were made to the code shared with pre-V7
versions, verified that V6 HAL didn't regress.

Bug: 142480271
Test: atest VtsHalAudioV6_0TargetTest
Test: m VtsHalAudioV7_0TargetTest
Change-Id: I0e42fe1279912ffa78ce40c69f6aa2054e84d385
Merged-In: I0e42fe1279912ffa78ce40c69f6aa2054e84d385
diff --git a/audio/7.0/IStream.hal b/audio/7.0/IStream.hal
index 4fe8218..ab9aa7d 100644
--- a/audio/7.0/IStream.hal
+++ b/audio/7.0/IStream.hal
@@ -66,9 +66,10 @@
      * Retrieves basic stream configuration: sample rate, audio format,
      * channel mask.
      *
+     * @return retval operation completion status.
      * @return config basic stream configuration.
      */
-    getAudioProperties() generates (AudioConfigBase config);
+    getAudioProperties() generates (Result retval, AudioConfigBase config);
 
     /**
      * Sets stream parameters. Only sets parameters that are specified.