z2_plus: Update auto-brightness overlays

 * Based on stock values (MIUI 7.1.19 global dev)

Change-Id: Iac625e98d2cf8f0ed5776dadb077c232512d3e2b

overlay/frameworks/base/core/res/res/values/config.xml

@@ -79,6 +79,21 @@
          The user is forbidden from setting the brightness below this level. -->
     <integer name="config_screenBrightnessSettingMinimum">1</integer>
 
+    <!-- Stability requirements in milliseconds for accepting a new brightness level.  This is used
+         for debouncing the light sensor.  Different constants are used to debounce the light sensor
+         when adapting to brighter or darker environments.  This parameter controls how quickly
+         brightness changes occur in response to an observed change in light level that exceeds the
+         hysteresis threshold. -->
+    <integer name="config_autoBrightnessBrighteningLightDebounce">2000</integer>
+    <integer name="config_autoBrightnessDarkeningLightDebounce">2000</integer>
+
+    <!-- The maximum range of gamma adjustment possible using the screen
+         auto-brightness adjustment setting. -->
+    <fraction name="config_autoBrightnessAdjustmentMaxGamma">200%</fraction>
+
+    <!-- Period of time in which to consider light samples in milliseconds. -->
+    <integer name="config_autoBrightnessAmbientLightHorizon">5000</integer>
+
     <!-- If this is true, the screen will come on when you unplug usb/power/whatever. -->
     <bool name="config_unplugTurnsOnScreen">true</bool>