packages/SystemUI/res/drawable/ic_sysbar_home_carmode.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="44dp"
        android:height="44dp"
        android:viewportWidth="44.0"
        android:viewportHeight="44.0">
    <path
        android:pathData="M22.39,22.39m-14.54,0a14.54,14.54 0,1 1,29.07 0a14.54,14.54 0,1 1,-29.07 0"
        android:fillType="evenOdd"
        android:strokeColor="#F8F9FA"
        android:fillColor="#00000000"
        android:strokeWidth="4"/>
</vector>