audio: Provide code for parsing surround sound config from XML

The main change is to convert the result of parsing from XSDC
types to AIDL, and add a VTS test for IConfig.getSurroundSoundConfig.

Extra changes:
  - add 'Unchecked' suffix to conversion functions that do not
    wrap the result into ConversionResult;
  - enable more compile-time checks for the default AIDL service,
    fix issues found.

Bug: 205884982
Test: atest VtsHalAudioCoreTargetTest
Change-Id: Icf578b8d28647e6355ed5328599c77d2ca1234f9
diff --git a/audio/aidl/common/include/Utils.h b/audio/aidl/common/include/Utils.h
index 652d63c..bd903d7 100644
--- a/audio/aidl/common/include/Utils.h
+++ b/audio/aidl/common/include/Utils.h
@@ -102,7 +102,8 @@
 constexpr bool isDefaultAudioFormat(
         const ::aidl::android::media::audio::common::AudioFormatDescription& desc) {
     return desc.type == ::aidl::android::media::audio::common::AudioFormatType::DEFAULT &&
-           desc.pcm == ::aidl::android::media::audio::common::PcmType::DEFAULT;
+           desc.pcm == ::aidl::android::media::audio::common::PcmType::DEFAULT &&
+           desc.encoding.empty();
 }
 
 constexpr bool isTelephonyDeviceType(