Update gesture related settings in Display.

1. Remove "Press power button twice for camera. Toggle is now available
in Settings->Gestures.
2. Remove toggle from "Ambient Display" and make it point to
Settings->Gestures->Quick screen check.

Bug: 28565958
Change-Id: I32fd2253a40be76ac9843a627df153eb4f1307d8
diff --git a/res/xml/gesture_settings.xml b/res/xml/gesture_settings.xml
index e68d8f5..5adc311 100644
--- a/res/xml/gesture_settings.xml
+++ b/res/xml/gesture_settings.xml
@@ -16,7 +16,8 @@
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/gesture_preference_title">
+    android:title="@string/gesture_preference_title"
+    settings:keywords="@string/keywords_gesture">
 
     <com.android.settings.gestures.GesturePreference
         android:key="gesture_double_tap_power"