keystore2/android.system.keystore2-service.xml

<manifest version="1.0" type="framework">
    <hal format="aidl">
        <name>android.system.keystore2</name>
        <version>4</version>
        <interface>
            <name>IKeystoreService</name>
            <instance>default</instance>
        </interface>
    </hal>
</manifest>