Add Settings strings for power button behavior (accessibility)

Bug: 2364220
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 646c038..edf0ddc 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -2007,6 +2007,12 @@
         applications installed.\n\nYou can download a screen reader for your device from Android
         Market.\n\nClick "OK" to install the screen reader.</string>
 
+    <!-- Accessibility settings: Power button category -->
+    <string name="accessibility_power_button_category">Power button</string>
+    <!-- Accessibility settings: checkbox title for power button behavior -->
+    <string name="accessibility_power_button_ends_call">Power button ends call</string>
+    <!-- Accessibility settings: power button behavior summary text -->
+    <string name="accessibility_power_button_ends_call_summary">During a call, pressing Power ends call instead of turning off screen</string>
 
     <!-- App Fuel Gauge strings -->
     <skip/>