idea/src/META-INF/android-lint.xml

<idea-plugin>
    <extensions defaultExtensionNs="com.intellij">
        <externalAnnotator language="kotlin" implementationClass="org.jetbrains.android.inspections.lint.AndroidLintExternalAnnotator"/>
    </extensions>

    <extensions defaultExtensionNs="org.jetbrains.uast">
        <uastLanguagePlugin implementation="org.jetbrains.uast.kotlin.KotlinUastLanguagePlugin"/>
    </extensions>
</idea-plugin>