framework: add config_ledCanPulse overlay setting

<?xml version="1.0" encoding="utf-8"?>

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<resources>

    <!-- We don't want to publish private symbols in android.R as part of the

         SDK.  Instead, put them here. -->

    <private-symbols package="com.android.internal" />

    <!-- LED pulse -->

    <java-symbol type="bool" name="config_ledCanPulse" />

</resources>

         Used to decide if the user can change the colors -->

    <bool name="config_multiColorBatteryLed">false</bool>

    <!-- Do the battery/notification LEDs support pulsing?

         Used to decide if we show pulse settings -->

    <bool name="config_ledCanPulse">true</bool>

    <!-- Default value for LED off time when the battery is low on charge in miliseconds -->

    <integer name="config_notificationsBatteryLedOff">2875</integer>