Implement a.h.audio.common@7.0-util module

This includes a rewrite of HidlUtils for V7.
A unit test is added for its conversion functions.

Made necessary minor adjustments to the HAL V7 types.
Also, fixed definition of 'audioFormatsList' to allow for
vendor extensions.

Bug: 142480271
Bug: 173647783
Test: m && atest android.hardware.audio.common@7.0-util_tests
Change-Id: Ib883f1c246fce78c004846516699aa724d4b5d44
diff --git a/audio/7.0/config/audio_policy_configuration.xsd b/audio/7.0/config/audio_policy_configuration.xsd
index 6784828..56b3a27 100644
--- a/audio/7.0/config/audio_policy_configuration.xsd
+++ b/audio/7.0/config/audio_policy_configuration.xsd
@@ -774,13 +774,13 @@
         </xs:sequence>
     </xs:complexType>
     <xs:simpleType name="audioFormatsList">
-        <xs:list itemType="audioFormat" />
+        <xs:list itemType="extendableAudioFormat" />
     </xs:simpleType>
     <xs:complexType name="surroundFormats">
         <xs:sequence>
             <xs:element name="format" minOccurs="0" maxOccurs="unbounded">
                 <xs:complexType>
-                    <xs:attribute name="name" type="audioFormat" use="required"/>
+                    <xs:attribute name="name" type="extendableAudioFormat" use="required"/>
                     <xs:attribute name="subformats" type="audioFormatsList" />
                 </xs:complexType>
             </xs:element>