audio: Update common types to better match legacy structs

HAL V7 types were updated to better match data structure
definitions from the legacy HAL:

 - Added 'AudioConfigBaseOptional' struct to match
   legacy structs that have 'mask' field to specify
   initialized fields.

 - All fields in 'AudioConfigBase' made mandatory.

 - Removed 'EffectConfigParameters' in favor of
   'AudioConfigBaseOptional' and safe_unions.

 - Added missing enum string values to ensure that round-trip
   conversions from the legacy HAL to HIDL and back to legacy
   preserve enum values.

Bug: 142480271
Test: atest android.hardware.audio.common@7.0-util_tests
Test: atest VtsHalAudioV6_0TargetTest
Test: atest VtsHalAudioV7_0TargetTest
Test: atest VtsHalAudioEffectV7_0TargetTest
Change-Id: If02a81b3f6790a8eb315fa57123141aad2419132
diff --git a/audio/7.0/config/audio_policy_configuration.xsd b/audio/7.0/config/audio_policy_configuration.xsd
index 56b3a27..685e84a 100644
--- a/audio/7.0/config/audio_policy_configuration.xsd
+++ b/audio/7.0/config/audio_policy_configuration.xsd
@@ -329,6 +329,7 @@
     </xs:simpleType>
     <xs:simpleType name="audioFormat">
         <xs:restriction base="xs:string">
+            <xs:enumeration value="AUDIO_FORMAT_DEFAULT" />
             <xs:enumeration value="AUDIO_FORMAT_PCM_16_BIT" />
             <xs:enumeration value="AUDIO_FORMAT_PCM_8_BIT"/>
             <xs:enumeration value="AUDIO_FORMAT_PCM_32_BIT"/>