Add a checkbox to the Dock settings to control insertion/removal sound effects.

The sounds are present in the build but are turned off by
default (and there isn't currently a UI to turn them on).

(Mentioned in http://b/2469862)

Change-Id: I9ded1d67cc19204113047aeb8fc8b0123cea1427
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 49231d1..f06211c 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1033,6 +1033,12 @@
     <string name="dock_not_found_title">Dock not found</string>
     <!-- Dock not found dialog text -->
     <string name="dock_not_found_text">The phone must be docked to configure dock audio</string>
+    <!-- Dock settings screen, dock events SFX setting check box label -->
+    <string name="dock_sounds_enable_title">Dock insertion sound</string>
+    <!-- Dock settings screen, setting option summary text when check box is selected -->
+    <string name="dock_sounds_enable_summary_on">Play sound when inserting or removing phone from dock</string>
+    <!-- Sound settings screen, setting option summary text when check box is clear -->
+    <string name="dock_sounds_enable_summary_off">Don't play sound when inserting or removing phone from dock</string>
 
     <!-- Acounts & Sync settings screen setting option name to go into the screen for data sync settings-->
     <string name="sync_settings">Accounts &amp; sync</string>