FP6: overlay: Convert config_screenBrightnessDoze to float

    <!-- Screen brightness used to dim the screen while dozing in a very low power state.

         May be less than the minimum allowed brightness setting

         that can be set by the user. -->

    <integer name="config_screenBrightnessDoze">17</integer>

    <item name="config_screenBrightnessDozeFloat" format="float" type="dimen">0.06667</item>

    <!-- The default volume for the notification stream -->

    <integer name="config_audio_notif_vol_default">4</integer>