Android13修改背光最大值及默认值

原生位置：frameworks/base/core/res/res/values/config.xml

MTK平台修改：vendor/mediatek/proprietary/packages/overlay/vendor/FrameworkResOverlay/res/values/config.xml

其他平台注意是否需要修改overlay下的config.xml

    <!-- Minimum screen brightness setting allowed by power manager.
    Set this to 0.0 to allow screen to go to minimal brightness.-->
    <item name="config_screenBrightnessSettingMinimumFloat" format="float" type="dimen">0.0</item>  //最小亮度
    <!-- Maximum screen brightness allowed by the power manager.
    Set this to 1.0 for maximum brightness range.-->
    <item name="config_screenBrightnessSettingMaximumFloat" format="float" type="dimen">0.9</item>  //最大亮度，这里改成0.9，意思是将原本90%的亮度值做为100%来计算
    <!-- Default screen brightness setting set.
    Set this to 0.4 for Default brightness Float.-->