libaudiohal: Address TODO in StreamHalInterface

- Remove getSampleRate, getChannelMask, getFormat
  methods;

- Add an overload of getAudioProperties which takes
  audio_config_base_t;

- Update client code.

Test: m, test audio on device
Change-Id: I36bd1119a2b75991e42aa07b431359da1364fd42
diff --git a/services/audioflinger/AudioStreamOut.cpp b/services/audioflinger/AudioStreamOut.cpp
index 7e06096..d8565bd 100644
--- a/services/audioflinger/AudioStreamOut.cpp
+++ b/services/audioflinger/AudioStreamOut.cpp
@@ -173,22 +173,15 @@
     return status;
 }
 
-audio_format_t AudioStreamOut::getFormat() const
+audio_config_base_t AudioStreamOut::getAudioProperties() const
 {
-    audio_format_t result;
-    return stream->getFormat(&result) == OK ? result : AUDIO_FORMAT_INVALID;
-}
-
-uint32_t AudioStreamOut::getSampleRate() const
-{
-    uint32_t result;
-    return stream->getSampleRate(&result) == OK ? result : 0;
-}
-
-audio_channel_mask_t AudioStreamOut::getChannelMask() const
-{
-    audio_channel_mask_t result;
-    return stream->getChannelMask(&result) == OK ? result : AUDIO_CHANNEL_INVALID;
+    audio_config_base_t result = AUDIO_CONFIG_BASE_INITIALIZER;
+    if (stream->getAudioProperties(&result) != OK) {
+        result.sample_rate = 0;
+        result.channel_mask = AUDIO_CHANNEL_INVALID;
+        result.format = AUDIO_FORMAT_INVALID;
+    }
+    return result;
 }
 
 int AudioStreamOut::flush()